Let's be clear, I don't care about tolerance, I care about truth, justice, and
Really. Go look through the archives of metafandom, entire essays built around that very premise were de rigeur before ~2008.
This was a serious attitude and a common one at that. So yes, I was happy when fandom seemed to say "enough" and the trolls were driven back. Unfortunately, five years after the books finished and a year after the movies have, there are still some people stuck in the past. These poor dears, when using such well-reasoned arguments as "So-and-So is a Mary Sue!" are often left confused when these arguments meet resistance. Everyone over at FictionAlley and their insanejournal community thinks they're brilliant, so what's wrong with these people at LJ and tumblr?
The problem isn't that you dislike these characters. I don't care much for the twins or the Marauders. I don't hate them, I just don't like them much either. It's not because they're obnoxious, I like plenty of obnoxious characters. Ginny can be an obnoxious character and I like her. It's not because they could be bullies, which they could. Draco was a bigger bully than the twins and his bigotry made him worse than James and Sirius but I like him. It's just that, for whatever reason, these characters don't do much for me. It happens.
And it's not about being "politically-correct". I hate fandom's tendency of creating "feminist purity tests" and measuring female characters against them only to inevitably find them wanting and fail them for being human. Has traditionally feminine interests? Fail. Cried, at all, ever? Fail. Wanted a man to like them? Fail. Has ever had a moment of weakness? Fail.
This is about holding female characters to a higher standard than their male counterparts and tearing them down when they inevitably fall short.( But more importantly, it's about tired-ass arguments that really need to be put out to pasture already. )