I'm totally with OP @bertoletdown and others who have agreed, but wanted to point out for those who didn't see the video before it was taken down that (1) it was taken with a telephoto lens from a distance, (2) the subject wasn't a "wook" in appearance or doing crazy tripped out potentially unsafe to others things in "a crowd of 30000".

He was sitting on the grass in an uncrowded area, "dancing" by bopping his head, moving his hands and sticking out his tongue like a lizard as Crosseyed & Painless played, but there was no proof other than the snarky comments of the YouTube poster, that he was on LSD or similar drugs. It was pretty normal and tame, except for some bullies/asshat's deciding to film it and put it on YouTube.

It was plain and simple an invasion of privacy, in the sense that people do expect to go to a Phish show, dance like no one's looking and not turn up on YouTube under some derogatory titled video.