This doesn't surprise me at all. At the show I went to a riot could have broken out at any point.
He dove into the crowd like 15 times, and on one occasion lost his hat in the process. They stopped the show and demanded it back. When someone returned it, presumably after having found it on the ground, his crew accused the kid of having stolen it off Rocky's head. It was all kinda awkward and a buzzkill.
Also, Rocky sort of scolded some girl for ripping his t-shirt, which seemed unfair. He was diving into crowds of people who love his music and waited like 3 hours to see him. I don't know why he was surprised or offended that people got too excited and ripped his shirt.
If you're going to go the wild crowd-surfer route, do it all the way. Don't get butthurt and call people out if your hat falls off or your shirt rips.