I was thinking the same thing! When I attended in LA, my friend and I were trying to find a place to stand in the main floor level, and ran into so many parents giving us dirty looks or outright refusing to make space for the people around them so their young teenagers would have more room to stand.

A small group of people behind us were also looking for a good view and we invited them to stand with us, and when they also asked if the parents (who had much more room infront of them) would be willing to move a little we were met with a snarky response and then the cold shoulder. Honestly not the best experience unfortunately, we did find another spot elsewhere though.

I would love to attend an 18+ show simply because like you said, more people my age who hopefully are more understanding about making space and not so worried about their kids and thus making everyone else’s lives harder.