Yes, they are. Its just that any one isolated indecent of disapproval doesn't get much attention compared to incidents of scum. I'm not saying the levels of scum are acceptable, just that there is a disparity in which encounters get shared.
The disapproval needs more mindshare, and thats why I think it was a smart move that defcon staff embraced the red/yellow cards. Nobody is really going to walk around telling everyone about the time they saw a guy tell another guy to knock it off. The cards on the other hand, they had plenty of people talking.
On the whole though, we tend to look out for our own. Stories like this: http://yro.slashdot.org/comments.pl?sid=3043545&cid=4096... and this: http://yro.slashdot.org/comments.pl?sid=3043545&cid=4096... tend to be much of my 1st hand experience, the worst I know of first hand are people that don't known any better than to stare at someones tits.