I'd rather meet nice players and take a little longer to complete a dungeon than bored vets who can't even say "hi" and rush trought everything.
When I play my PLD, I always take the time to explain mechanics ( even if english isn't my first language). I never get mad if we wipe. I remember this one time in Bray normal @ second boss, when I just said " don't forget to sleep the boss when the add spawn" and then, the healer stopped healing me and we all died.
After we respawned, s-he said s-he just froze while figuring how to sleep. I can imagine him-her panicking behind his-her screen and I couldn't get upset because we all had in our life this moment when we get flustered because of stress or fear. So I told him-her to take it easy, and relax, and only focus on healing me while my friend ( who is BLM) would take care of the boss. We ended the dungeon without any more wipe and I could felt s-he was really happy and more confident over his-her own skills.