I don't want to tank dungeons anymore...

[Anapingofness]

snip

My rule of thumb as a tank: If someone pulls "for" me once, I will ask them not to pull for me.

If it happens again or that person gets uppity, I will drop tank stance and just dps- thereby letting them tank since they want to tank so badly.
If people get nasty about it two things will happen.
1. I will try to reason with them (and I mean reason. You must never get into it with these people)
2. If I cannot reason with them I will either Return > Manual exit or just Menu > Leave Dungeon. As a tank I could care less about the 30min lockout timer, I get instaqueues ^.~
2.5. Once I am out of the dungeon I will summarily report those people for harassment.

Bottom line OP, don't let others spoil it for you. -feeds cookies-

[Almalexia]

My rule of thumb as a tank: If someone pulls "for" me once, I will ask them not to pull for me.

If it happens again or that person gets uppity, I will drop tank stance and just dps- thereby letting them tank since they want to tank so badly.

My rule of thumb as a DPS: If someone deals damage "for" me once, I will ask them not to attack for me.

If it happens again or that person gets uppity, I will drop my Fists of Fire and just 123 -thereby letting them DPS since they want to DPS so badly.

My rule of thumb as a healer: If someone heals "for" me once, I will ask them not to heal for me.

If it happens again or that person gets uppity, I will drop my Cure and just spam Regen- thereby letting them heal since they want to heal so badly.

Do you see how silly and selfish this makes you sound?

[Anapingofness]

Do you see how silly and selfish this makes you sound?

No, actually, I don't see how 'silly and selfish' I sound mainly because your examples don't make sense.
But then again, Miste explained everything quite eloquently.