Concert sitting/standing etiquette

We went to see Elton John last night. We were sitting pretty far down in the uppers and there were two slightly overweight maybe 25 year old girls a couple of rows in front of us. The concert started and everyone stood up when he took the stage of course but everyone settled in and sat down pretty quick. The two girls in front of us were the kind of concert goers who film the entire thing and act like every major hit is their favorite song. I gave them a pretty long leash but once 5 or so songs passed and Elton John started playing some slow songs I had enough considering they were the only people in the arena not on the floor standing up.

I stood beside one of them in the aisle and asked if they could sit down. She looked at me confused and said no. I said "be courteous of the people behind you. They can't see." She said "that's not my problem." After that I'm pretty heated and started pointing around the arena yelling over the music "you're the only people in the arena standing. Have some self-awareness." She said they're not sitting down and not wanting to take it any farther went back to my seat.

I understand people will stand at a concert but that's if it's a fast paced rock show. Something like Elton John that's slow paced and most of the audience is 65+ then you should be sitting. The main rule to follow is if everyone is standing you stand and if everyone is sitting you sit.

Maybe I'm just getting old but I needed to vent out a long post and see what others thought because I'm still agitated about it. Mainly what I'm pissed about is it was these two dumbass girls who are the kind of fans of a band that think songs like Bennie and the Jets and Crocodile Rock are the best songs and have no idea what Amoreena and Burn Down the Mission are blocking my view the whole time. At least I got some cred from the old folks around us.