Is cinema etiquette dead?

Went to see Deadpool Wolverine tonight and there was a girl front row with her shoes off and bare feet up on the pull out table, scrolling through instagram on full brightness during the film. BF told her to put her phone away and thankfully she complied, but wtf??

Last week, we saw Longlegs (lots of silence, suspense, tension) and a group of teen girls not only arrived 15 mins late, but entered the cinema by running down the corridor laughing and shouting “boo!”. Then spent the whole movie talking loudly, on their phones, and dipping out every 15 minutes only to stomp back in.

I popped out to take some medication at one point about halfway through and they were just sat on the floor in the lobby chilling on their phones? What's even the point in buying a ticket??

Are these two unfortunate isolated incidents, or is cinema etiquette dead? I really think there should at least be staff checks during films to make sure no one's being a cock.