Both. You do you! It's ok

I've never sat through a concert tho'.

I'm in the pit, or as close as I can get to the stage.

Yup everyone here in U.S. stands, but when I'm up like near the nosebleed section, I'll just seat dance, thank you. Don't enjoy standing up so close to edge😩

kinda shitty if you're in the front or middle for sure. if you're in the back i'd say go for it bc there's no one behind you to block.

Depends...if you're going to block someones view than sit yourself down ....it's not hard to be considerate to others

If on the floor, it is what it is, but if I’ve paid good money for a stadium seat view, then I think it’s a bit rude

Rude. It obstructs the view of those behind you, who have paid to see and hear the performers, not the backs of leap-abouters, arm-wavers and phone-brandishers.