People don't have a reeeeal reason for hating Hathaway. Many just don't like her because they think she's talentless and didn't deserve an Oscar or they find her face annoying or they think she ruined The Dark Knight or blah, blah, blah. I think people just compare her to that kid in the Drama Club who was, like, toooooo much. She's like the Rachel Berry of Hollywood, perhaps, and people are just hating on her because it's a fad now to hate on Anne Hathway. IDK, personally, I love her. But whetevs.
Had this same question. So, with a WTF face, I scoured the internet for an hour, looking for the answer.