Comments like that have not discouraged me from tanking.

I'm at the point now where I don't have trouble holding threat, even when the party is being stupid and not following targets/aoeing, but prior to that, when they did need to watch their threat meters and follow targets, and would blame me for them pulling threat; I'd simply remind them I waited about 2 seconds in queue, and they could either follow instructions, or wait another 2 hours for a replacement. Even with the 15 min debuff you'll be in a new dungeon before them.