The Oscar-winner was the subject of a Life in Pictures retrospective at Bafta's headquarters in London, and during a question-and-answer session, she took the opportunity to scold big names stars for perpetuating a "hierarchical" system which favours the most famous.
Thompson insisted she was probably the only star to ever ask for a smaller trailer, adding, "The star system is not a good system. It's all hierarchical. I think that's just revolting. It is revolting for actors to become grand... and unattractive to watch."
She also claimed Hollywood "always finds a way to make you feel bad... (At parties, there is) always some bit that's penned off that you're not allowed into... (It is the) better than/less than judgment you're making upon yourself and others that Hollywood is particularly good at and that's the one thing I really hate."
However, Thompson went on to single out two actors who have remained grounded and eager to work hard: "Dustin Hoffman is as exquisite as Anthony Hopkins."
She recalled an incident while working on Last Chance Harvey with Hoffman when the actor's car became stuck in traffic, so he walked to the set in just his socks, adding, "He just wants to do it (act) so much... Those are the people you want to work with. You find some young actors who really can't be bothered and you think well, let someone else do it."
At the end of the session, Thompson was asked a question by a young woman who told the star she had just finished her first film script, so the actress asked her assistant to get the girl's details so she could read over the screenplay for her.