None of these are controversial in the slightest. I do actually have a controversial one:
Introverts who don't make an effort. I know I'll get slaughtered for saying it, but I do find it rude in social situations when people take a backseat and let others do the conversational heavylifting consistently.
I'm tired too. I think its inane too. You arent somehow more emotionally intelligent for remaining basically dumb throughout the entire evening, but you are rude because you're relying on other people putting in the effort to give the evening some semblance of meaning. Because if we all just sat there quietly well.... That would be awkward.