I'm confused by this. For those arguing that it was ok for delta to make the change, they seem to be arguing that the ga was trying to do it for the benefit of the passenger. Which is fine, and the ga may be trying to do something nice, but if the ga has the time to be meddling in individual seat assignments for no other reason than to please the passenger being moved, they should have enough time to contact the passenger first.

If it's for any other reason, OP's strange seat choice isn't relevant at all and the ga isn't doing it to please OP, but to please someone else.