I think real-life Bette Davis was a complete asshole. Ditto: Marlene Dietrich, Sinatra, Peter Sellers, John Phillips, Jackie Gleason, Joan Fontaine, Oprah, Nic Cage, Ryan O'Neal, Tom Hanks, Chevy Chase - just a bunch nasty socipaths, like show biz is filled with. It's probably easier to list the exceptions.
Another one I'll add is Mary Tyler Moore. I read an interview once - just about her only comment about her 27 year old son who'd just committed suicide was, "You give them everything but nothing is ever good enough for them." WTF?
Vanessa Redgrave also seemed unmoved after her daughter Natasha died. I read an interview soon after (she was doing a play) and the only Natasha comment was, "Ah Natasha - she was the merry one."
I also read an interview of Natasha once where she told about a dinner party where someone asked Vanessa what she thought about meeting the Dalai Lama at an event - or maybe it was Bill Clinton - some mega-person. Anyway, Vanessa said, "Dahling, all that matters is what he thought of ME!!!" (Natasha remarked, "Can you imagine what I've put up with all these years?")
Jane Fonda for becoming a God-damned Southern Baptist in her dotage. I always knew she was an airhead but give me a fucking break. And Republican-donor Joan Rivers - I loved her till I found that out. Ginger Rogers was a Repug too but it was a different age so that doesn't bother me as much as the current batch of wingnuts - but after 1940, Ginger went from being luminescent and just a joy to behold to being a mannered, prissy, over-bedazzled hag.
Always found Gene Kelly, Mickey Rooney, Van Johnson, Angelina Jolie, and Beyonce disgusting, for one reason or another (hammy, dumb, narcissistic)... I could go on all day. I think I'll try to make a list of who I do like (that won't take long)