I’d like to add, in light of recent conversations going around Tumblr, that is it perfectly all right to blog about what you don’t like. If you don’t understand a ship, or a character, or a show, and you want to post about it, feel free. Because in the end, it’s your blog and you can post whatever you want.
Don’t tag it. Don’t tag your anti-ship stuff with the ship name. Don’t tag your character hate with the character name. Tag it anti ~ship~ or ~character~ hate. Let people who like the thing like it.
And people who like something–as long as those who don’t aren’t being mean about it, leave them alone. This goes for morally grey characters, too. If you’re fascinated by their complexity, that’s cool. But if other fans of the show or movie or book find them less redeemable than you do… that doesn’t mean they don’t understand the character, or that they need to read the books again. It means they view the character differently than you do, and that needs to be okay.