Just because someone has the crown doesn't mean they're experts, some will ultimately need accommodations (although I personally feel that it's on the person to voice those needs at the start) . The game doesn't require you to complete anything other than extreme fights maximum and you also don't need every class maxed out. It's a flaw in the system that ultimately allows anyone with enough patience to get any form of mentorship. It's better to look at mentors as people to ask advice from if you need it rather than people who are automatically expected to know every aspect of every class and/or fight, the system simply doesn't filter people out enough for that to be realistic. Even the dungeon requirements only require a single clear to count. I'm not even going to get started on how braindead it is to get crafting mentor but you can have it in a few days if you really wanted it.

They were wrong for kicking you, I don't see that as any sort of reasonable response when pull sizes could have just been discussed and adjusted.