This is dumb. It's brokencyde all over again from last year. Sure they don't deserve to be on the tour and should be imprisoned for life for the shit they've created but a petition probably isn't going to do anything. Just bring glass bottles and it might turn out to be pretty fun..
It would only boost their egos to throw things at them. They want our attention. It would make a much bigger statement to just not be anywhere near their stage when they play. I'm sure it would hurt them much more to see that no one cares. Giving these shitty ass bands any kind of attention is only going to encourage them to continue making their shitty ass music longer.