I get very angry at people that shout "sit down".
It has a very high horse implication and doesn't belong at a football game.
I'm never the one to stand up and wave my arms wildly to get everyone standing, but I definitely will stand quickly on 3rd downs and don't have a problem with it. I can't say for sure, but I can't see myself complaining about it if I'm ever in a position where I can't stand as often due to age.
If someone says, "sit in your seat that you paid for" or something to that effect, it's an instant eye roll for me.