I find them annoying. Yes, I know I find everything annoying, and yes, BrazCon is no exception to my easily lit dynamite pack. Though they still aren't as annoying as losers in general (like the people A83 mentioned, or fatality droppers, early quitters, voice taunters), they manage to be a nuisance.
(Although I can't remember anyone other than BrazCon right now, I've met more than 5 of these people before. I'll list them here if I get the chance.)