Yeah I agree with this totally, I wouldn't myself have thrown stuff or even have booed but I am an old fart these days. I don't condone what they did at all but young kids can get angry. He is lucky there wasn't piss in one of the bottles, maybe there was!
Yes I guess you know what you are letting yourself in for but when it turns his fans against him, maybe he needs to think a bit more. He won't but maybe he should.
I am sure he will tt, just for you.