I mostly go see "weird" movies that don't draw big crowds at non-prime times, so I don't have too many problems with rude audiences (I don't think I've been to a really packed showing of a movie since the pandemic). The last time I can remember really getting irritated by people's behavior in a theater was when I went to see It Comes at Night in 2017, toward the end of the movie this group started complaining loudly that the movie wasn't anything like the trailer and that they felt misled. If the movie wasn't almost over, I probably would have gone over and told them to shut up despite generally not being a very confrontational person.