If that asshole does turn up to Download and starts doin that, I reckon the crowd will turn around and beat the shit out of him, throwing mud is just fuckin stupid really. If he doesn't want to see GnR or doesn't like Axl there'll be plenty of emo bands for him there to listen to.
sorry for the lame question, but what is an "emo band"? I don't get all the references to 'emo'.
And, I hope no one does throw mud because that is disrespectful to elders.