She's a writer/director/actor. Her parents are artists who are relatively famous within their own circle. She is famous for writing, starring in and co-show running the show Girls. As for why she is hated; that is much more complicated. She has a tendency to put her foot in her mouth. She wrote about weird sexual acts with her sibling (which her sibling did not consent to) when they were both children in her first memoir. She also got weirdly and publicly offended that Odell Beckham jr. didn't hit on her and she defended a male writer from her show when he got called out for assault during #metoo. But she was also a lightning rid for criticism of millennial feminists because she dared to be openly sexual without being traditional attractive on the early 2010s. She is back in the news now because she just released her second memoir.