Is Thanos the most hated villain in movie history...at least as far big mainstream movies, not films like Schindler's List of course? The reason I say that is because in my theater, people were cheering every time Thanos was overwhelmed by the heroes, they gasped whenever Thanos had the upper hand, whether it was during the fights or when he was learning about his future. And most importantly, people clapped, cheered, and a few people shouted things like, "Good! Bye bye! and Good riddance!" when Thanos turned to ashes. There was no sympathy from the audience at all. I don't think I've ever seen a villain get that kind of reaction from an audience in a theater. The Joker in TDK didn't. Darth Vader in RO didn't. The closest thing I can think of was the villain from No Country for Old Men, but that's not a big popcorn movie.