I can't really say if douchebr0z are necessarily worse than bearded twats who just stand and occasionally nod their heads.
A few years ago I saw Sunset Rubdown and there was this alpha br0 next to me constantly woo-ing and high fiving after like every song (how did this guy even find the band? does Spencer Krug post videos to CollegeHumor?) But the guy was genuinely enjoying himself and shouting along the lyrics (surprisingly he knew all the songs) which is more than I can say for the vast majority of the crowd who didn't seem to give a shit.
What I always wonder is, if we're getting all these br0z at Radiohead shows, what strain of superdouche is in the crowd at Kings of Leon or *shudder* Nickelback?