William Shatner
While at conventions, he has a huge attitude that fans and co-stars are forced to put up with. At one point, he shouted at Denise Crosby (Tasha Yar from Star Trek) any time she tried to answer a question. After seeing the way he acts toward his co-stars, it’s impossible to have respect for the man.
This is not what we expected from Shatner and it is sad to see the way that he is worshipped by his fans, even though he has a rather disrespectful approach towards all his co-stars and co-workers.