I'm kind of... not.
I think it should be the obligation of the community to put up with and help out people new to dungeons. Most people I've been in parties with ask at the beginning if there's anyone new to the dungeon, and for some first-time runs I've had people simply leave at the start.
That's on them, and that's reasonable if
they don't want to put up with it. But I don't think people should ever belittle anyone else for
not knowing or not having experience.
Speedruns in dungeons by nature should be for premade groups in an MMO, not the public queue, and it's unfair to assume that everyone else already has the experience that they've had just because they want to get their super EXP and super gil super fast. Especially in the Duty Roulette, whose
central design by nature exists as an incentive for players to assist newbies in dungeon runs that they may not necessarily participate in otherwise simply because it doesn't net enough for the day.