Don't really get what the issue is. No-one else in the party wanted to run at a slow pace, so they left.

What would you rather they have done? Tried to force a normal-paced run on you? Got argumentative? Kicked you?

They did not want to run the dungeon how you wanted, nor you how they did.
I would've done the same, I'd rather do something else for half and try again, then run a dungeon that is no fun (imo) at all