While I voted for STP, I am not so sure Billy beat out Scott for being a bigger asshole.
Scott Weiland signed on for one of those Rock Yacht tours where the fans hang out with the artists. One fan who paid a pretty penny asked Scott if he could get a picture with him. A belligerent and boozy Scott Weiland said something to the effect of "well, you paid your money right? Lets suck a dick".
Another fan on the cruise was telling Scott how STP really inspires him. Scott shut him down right away and informed the fan that he did not care to hear his story.
Plus there is all the missed gigs and flakiness that goes with him being an addict.