If I'm in a dungeon roulette, then I'm generally a lot more forgiving about this kind of thing and let people do as needed unless it's causing a detriment to the group. If I'm in coil or Extremes, I'm going to give people feedback on what they can improve on. If you're just plain bad, (hello all you DRGs that don't know how Heavy Thrust works!) you have no place doing top tier raids if you can't be bothered to at least learn the basic fundamentals of your job

If people're receptive to constructive feedback and are willing to learn and improve then I'm happy to keep them in my party. If they'd rather do unspeakable things to my mother, then they'll end up on my blacklist. Nothing lost in my eyes as they're not only terrible players but also the type I don't want to play with anyway.