Thank you for sharing your social media videos as evidence in a rebuttal to "camera phones are not all good; they're ubiquitous use has negative implication too". So delicious...

The irony!

Though, I'll grant that there's not really a way to argue this without showing videos

That sort of dancing is basically a sport. You have to learn it, you have to get good at it after you learned it, and it is cardio after all. I think op was talking more about what you see in the edm scene these days. Where basically people aren’t there to dance like the old days or sing along like other genres, they are there to see a certain DJ and then they will post clips from the entire set on their instagram story. And they can do this because the dancing they are doing at the edm show is super passive kind of dancing where you are just swaying a little so you can hold the phone stably at the same time. If you were dancing like how they’d dance at the edm concerts in the 90s all rolling on molly it would be like your blues swing where its just too physical to do anything but rave around flinging your arms all around shirtless and sweaty.