[CPlatypus]

I see the same thing even from my close colleagues. With one in particular, the first I'll even know he's using my code is when he bitches about it on Twitter. Forget about usable information in a bug report about what he did to trigger it (usually turns out to be utterly insane hacked configs), sometimes we've been talking on IRC and then I switch windows to find he's slagging the code on Twitter.

I think it's a cultural thing. Righteous anger is addictive. In this case it's anger at bad code, and the craving for another hit precedes any attempt to find out if the anger is even justified - let alone to work constructively toward a resolution. Some people (lots here BTW) are just rage junkies, and should simply be ignored.