There are a number of theories put forth by people who think it’s a bad thing. And perhaps some of them are accurate to a degree (not THAT much of a degree, but since I used to hold similar opinions, I can kind of see the mindset).
1. There isn’t actually a problem.
In their eyes, everything IS just fine. There USED to be major problems, there USED to be major issues of racism/sexism/etc., but that it no longer exists. You will notice the predominant majority (and bear in mind, MAJORITY, not ALL of them) are made up of, generally, heterosexual white men. AKA the people who HAVEN’T had the same kind of issues of systemic racism/sexism/homophobia/etc. Since they have not encountered it themselves or been a victim of it, they have difficulty seeing it as a real thing, believing that the experiences of others are exaggerated, misunderstandings, or simply “making it up” for attention or the like. This was an attitude I had back when I was a teenager (except for homophobia - I saw that as the next issue that needed to be tackled). This attitude was changed for me, at least, by actually TALKING to other people, listening to the experiences they had dealing with people of authority who brushed aside their concerns and viewpoints. I then saw it happening more and more often in comics - particularly on the sexism side of things with how women in comics were depicted, the artwork posing of them, the types of costumes they got vs. men, the increased amounts of fridging, you get the idea.
2. They don’t want this, they want THIS
Over the last 40-50 years, feminism in particular has been vilified, partly because of the aforementioned perception that nothing is wrong, but also by people like Rush Limbaugh who coined the term “feminazi,” believing that what feminists REALLY want is to turn the tables - to make women superior to men. There is of course a loud contingent that IS like that. Every group has it, but the fringes are exactly that: the fringes. The problem is that when you repeat something over and over and over, people start to BELIEVE it. Suddenly, the popular perception is “feminists want superiority, not equality.” And of course for the average person who DOESN’T spend their day thinking about issues like this (either due to a lack of experiencing it firsthand or just because they prioritize other things in their lives), their opinion is shaped by what other people say about the issue. And when people who HAVE parroted the “feminazi” logic of it are the ones who are predominantly spoken of in the media, whose opinions are repeated for the average people to hear, they in turn believe THAT position and find others who agree and then teach it to their own children and the cycle continues.
Bringing this point together again with the previous point, the assumption is made: if there is no real problem, then there is no need to change. And if there is no need to change, the people calling for change have a different agenda than they claim or are just naïve/stupid themselves.
3. People who honestly ARE naïve/stupid about it.
When people are angry, they want to express their anger. They want to share something, they want to DO something about it, because injustice IS angering. It’s infuriating to see something that we think is evil and supposedly nothing being done about it. But the thing is that the internet, since it provides us access to so much information, especially TRUE information, we take a lot of stuff we see at face value. We have to a lot of the time - there just aren’t hours in the day to look up EVERYTHING out there and confirm its truth. And if we get it from something that we trust, we have to assume it’s true, as well. But of course things CAN be wrong. The problem with language is that it’s the primary means by which we communicate and understand things… but because words and phrasing and tone can alter things so much, it’s easy to misinterpret something, to not realize something isn’t true or is said in jest but doesn’t actually denigrate others, so they go off on a tirade and provide fuel to people who think it isn’t real. After all, if it was, why would this person believe this obvious falsehood?
4. Honest to goodness racism/sexism/homophobia/etc.
I actually think there’s less of this than you’d think. Certainly many attitudes and stereotypes ARE bigoted, but it’s built around a lot of misconceptions, falsities, and perceptions that are inaccurate, not out of an active hatred. When we think something is stupid, we mock it, because we feel that others should know better. To change ourselves requires us to work at making ourselves better, be willing to recognize that we were wrong before, that we have changed… and if we think everything is fine, why bother changing? Why go through the work and rigmarole of it?
And so, with that mocking, terms are invented to describe them - feminazi, white knight, “Social Justice Warrior” - someone who fights for a cause that they don’t feel is a real cause. That their preferred method to change the world is by reblogging something or expressing outrage at something that might not be true. It reduces them into a punchline, a new word that is seen to denigrate them. But it doesn’t actually change anything, because it’s not an argument that actually disproves what they are saying, it’s just an insult. Because they, too, have things that they prioritize over, and having to fight about something that they don’t actually care about all that much themselves requires effort. Or, if they do, they’ll go to unreliable sources that they are unaware are unreliable.
The best thing you can do is to just keep spreading your word your own way. Share facts that you think are accurate, statistics that help justify your position, show people how they really seem to feel about a matter and try to be accurate to who they are now vs. how they used to be, because people change, attitudes and viewpoints change, and the only way that happens is by spreading information and talking about it. You may not change the person you were directly addressing, but you might change someone else who was just watching and deciding for themselves how they feel about it.
You truly win a fight by being the better person. Because if there is one thing that history DOES show us is that things DO change. Things DO change for the better. It won’t happen instantly and it’s a long struggle to do so, but in the end, better people DO prevail.