Got kicked Right before boss.

[Vahlnir]

Honestly I would have kicked anyone not preforming their role (i.e tank losing threat everywhere, healer not healing etc), replace and move on, it's not the end of the world if they don't take any advice I won't waste it if they haven't caught onto how to do their primary role by lvl 50.

Since the group in question put up with this tank for the entire dungeon, kicking them at the end was really pointless. It accomplished nothing, really. If I was there I likely would have voted against it. But...they were in their right to do so. Whether it was ethically right or wrong is up for debate, but the GMs likely won't interfere because it's a difference in playstyles thing.