I don't think they get out of their parents basement often enough to attend a concert. If they did do a stage dive, it would only be with their selfie stick.
I don't know nothin about no milenial. What I do know is that the new generation of ragers and ravers now do ecstacy like it is candy. So, they are so zoned, they will definitely bring back stage diving. If you bang your head often enough, Trump doesn't seem so bad.