So, leveling 50-60, you'll notice a very common reoccurring theme within Bards and Mechanists.
If you say even one seemingly negative thing about them, they will either throw the biggest *****fit ever, or they'll leave the duty outright.
Case in point? Today twice while spamming Library on Dragoon, I got two bards on two seperate runs. I enter in and say "Ew Bard" as a joke, and they leave the duty instantly. Not that it matters much - the spot fills instantly - but are people really so sensitive about Bard right now that they'd rather eat a 30 minute cooldown instead of just doing the run? XD Mind you, these are all 59 Bards.
I come from a job that is literally ridiculed no matter how well you do, and anyone who talks bad about Dragoons will just say "It's just a joke." So while I disagree with the joke, I've never ragequit from a dungoun or treated people badly for it.
Mechanists react exactly the same. Is a little playful teasing too much for ranged DPS? XD