Yet another pet peeve of mine is people who are racist, nationalist, or jobist.
A, race has very little impact on the overall usefulness of a character. Because of how various stats influence each job differently, race is more of an aid to play a job one way over another, rather than dictating how useful he is at that job. I've had the same ratio of great people to not-so-great people on all 5 races of each gender.
B, people who take patriotism to a really dumb level just get under my skin. The best example of this I could think of was in a CoP static. The 5 of them were San d'Orian and I was the only person from Bastok. I actually underwent relentless, annoying torment for like 3 hours before the event was over and I quit the static. Jokingly saying "Lastok" or "Suck d'Orally" is fine once in a while, but there's no reason to initiate Vana'diel World War I over it.
C, people who take the whole "lolJOB" thing too far. It's true that some jobs aren't the most useful in the game right now, but each update those jobs change, and by the time we've settled in at Lv.99 I think we're going to see a really good balance of usefulness between each job. Until then, though, seeing people openly mocked for playing jobs that they probably worked really hard on is just ridiculous.
Just remember guys, it's a game. Have fun, but don't be a smeg-head about it.