Pub quizzes can attract 'pub quiz bores' - the giveaway is that they call their team the Dead Parrots, and are seriously earnest and take it far too seriously for their own, never mind anyone else's good.
If they lose, they get really nasty about it, as though winning is their right, and it can spoil the fun for everyone.
On our cruise holidays, there is a team quiz at 10:30, general knowledge, teams up to six, and we usually find a team to join, or to join us, and if we win, great, and if not, who cares.
There was a Music Quiz in the afternoons this time, on sea days, I went in for six of them, and was a 'team' on my own, and I won all six! I would do, it's my passion and my profession, and fortunately no-one got hissy about it, but I could see that if there were more, and I kept on winning, there could the sort of attitude I mentioned earlier.
I think the trick is to not take it seriously, do your best, and ride out the looks and mutterings, it is for fun, and life is too short to get het up about it!