I thought INxPs are biggest flakers with social dominants being the flakiest of the bunch. I don't know any other type that is as notoriously flakey or moody as INxPs.
I definitely flake but I don't do it out of passive-aggressiveness, nor anxiety about attending something I wasn't set on anyway, I do it 'cause I'm moody with my commitments. Don't feel like attending the latest concert with friends or something...? Don't, pretend I've got other necessary commitments. I never agree to something I'm not set on, I'll give others that much however I will also wake up and have a sudden change of mood and decide to flake out of something. I honour my flaking by bothering to contact them and letting them know that I'm unfortunately flaking on them.
If I weren't so moody, it wouldn't be a problem but as I said, I never say yes to things I dislike to begin with.