Iggy Azalea
The Aussie star is known for having thick skin and quick wit to match. She's had a lot of hate in her time on the stage and a lot of beef with other famous artists. She's also known for participating in social media fights among random non-celebrities. A lot of people seem to have issues with her... Nowadays, she's further off the radar, mainly because she butts heads with almost everyone on social media, fans and other celebrities alike. She's had fights with stars like Zayn Milk, RuPaul, and Azealia Banks (which isn't hard to do, really).
William Shatner
Anyone who has met William Shatner in real life can attest that Captain Kirk is not as pleasant as one might think. Over the years, dozens have reported being disappointed by their hero. "I once saw William Shatner charge a kid $100 for an autograph because he was asking outside of the fan expo he was attending," recalled one former fan, "and then I heard a rumor he was charging $100 inside anyways." Clearly, Shatner does not care about the people who support him.