The Harry Potter Fandom is worse, way worse. Same with Supernatural (almost the worst of the worst, though, it is my main Fandom). But I get what you're getting at here.
Personally, the specific ships you mentioned I respect and have little to no problem with (except Mystrade) but people do f**ked up shit with basically every ship, especially, those. If there isn't something already messed up about the ship, they're going to make it messed up. And if it already is, then they're going to make it a million times worse. Which is the part of it that pisses me off.