Weird how there's so many of you who simply don't care about the people around you.
It's all symbiotic, and really not that hard to work out, with a few kind words and general respect. Communal appreciation of art works best when things are handled with give and take for everyone involved.
It's not about sitting or standing. It's about going with the crowd flow, being a symbiotic audience. It happens a lot. And sometimes it doesn't. Usually because of a minority.
LOL, if any classic rock bands have fans that sit and immerse themselves in the music, instead of fist pumping and dancing, it's Rush nerds. I know. I watch 'em do it. I'm not somebody who sits at a Rush concert....unless everyone around me is doing the same.
It's not nice to disregard others at a communal gathering of art and joy.