Upload & Sell: Off
Happened to me the other day. Obviously in my head I was cursing the guy, but it's not my place to tell someone else what is professional or not. If it really, really, realllllyyyy bothers you mention something to the staff working the event, but even then you just look like a pain to them now and they probably won't do anything if they haven't already. You can be the photographer that's worried about others, or you can just worry about yourself and get the job done. Getting the job done just tends to be easier from what I've learned. The most I've "restricted" other "photographers" is on my turf (shooting for the university) when they don't have passes, even then it's just a simple "hey, I'm shooting for SU and I would really appreciate if you could give me some space so I can concentrate on my work, thanks", it's just not our place.