If Kaneki was a girl, some people would hate him for being so clumsy. They would call him useless and after the Aogiri arc, they’d find him arrogant and cocky. After all, he made bad choices.
If Touka was a boy, some people would realise how complex her character is. They would enjoy how mysterious she is and they’d forgive her mistakes. They’d also realise how caring she actually is. She punched Kaneki? Nah she was just helping him, no problem.
If Ayato was a girl, some people would hate him for being so annoying. They’d find him stupid and talk about how useless it was for him to join Aogiri in order to protect hi sibling. He’d just be an arrogant brat.
If Hinami was a boy, some people would finslly notice how mature she is. They’d understand how difficult those times has been for her and how brave she is for still being able to smile. Her concern for her big sister and brother would be praised.
If Amon was a girl, some people wouldn’t care much about how strong-willed he is. They’d see him as one among others and find him irrelevant.
If Akira was a boy, some people would find her really interesting and admire her intelligence and calm behaviour. They’d feel sad for her and understand that despite what happened, she’s able to remain strong. Just look at that smirk.
If Tsukiyama was a girl, some people would find him stupid, calling him drama queen and complaining about how he’s always overreacting. The fact that he truly cared about Kaneki would soon be forgotten.
If Suzuya was a girl, some people would just label her as the psychotic annoying chick. Yes sure, he was raised by ghouls, whatever.
If Yoriko was a boy, some people would find her friendship with Touka really cute and they’d wish to see her more. She was there for her friend and thanks to her, Touka was able to have a glimpse of a ‘normal’ life.
If Hide was a girl, some people wouldn’t care less about him. They wouldn’t like how close he is to the main character and how they share a special bond.
If Eto was a boy, she’d be seen as a poor tortured individual instead of a psychotic bitch.
If Arima was a girl, some people wouldn’t care much about how mysterious he is.
And so on.
I’ve seen many posts about female characters recently and this is the result.
I’m stressing the ‘some people’ because I know not everyone thinks like this (hopefully). Of course you can dislike a character but just don’t hate (nor spread the hate) if you’d have loved a female character for the same traits as a male.