That has nothing to do with him facepalming Aizen.
Makes me more or less annoyed with the situation and demonstrates exactly how bad his character is with that face palm. Aizen is built up for all this time, after what? a Two hundred chapter arc? And the second Ichigo arrives to combat what should be Aizen nearing his prime.... He gets faceplamed and tosses away!
It's terrible! That whole fight was pathetic. Because of the whole situation, which was badly written and annoying, I say that it was a bad facepalm. Whereas Juubito's isn't an asspull, the beginning of taking out the largest bad guy with what seems like little effort, and somewhat makes sense.
THAT is why it has to do with the facepalm. The whole arrangement that went on makes the facepalm dumb, and the character who faceplamed was dumb as well.