If you're going to disregard the way 23 other people may want to run a dungeon, don't be surprised when they single you out. If you want to play as a class, you really don't have any business complaining later. You want to have fun and do something different and that's fine, but don't pretend it's perfectly valid for a whole alliance of other people to have to suck it up and not say anything when they see you intentionally gimping yourself for no reason.