Why this topic?
I think it's better to make clear what's the one and only point of this topic:
A way to deal with people disrupting the game experience with toxic behaviors is needed.

This is what happened:

We enter "The Stone Vigil" dungeon with:
PLD, SMN (me), BRD, SCH. All is good until, after a pull, I get aggro on a Ziz and I die (my bad), so does the whole party soon after.
PLD says: "good job you killed us all" (legit).
I ask if he can just tank the Ziz first to avoid problems. He goes silent and just refuse to tank from that point (he just followed us and rolled on every loot). We had to try and finish with just 3 people and we failed ofc...

TL;DR:
One single guy busted a dungeon run for the other three people intentionally.

This is the answer I got after calling, in desperation, GM support during the run:



Yes... because leave and retry after 50 minutes in and getting to last boss is the solution.