I don't have any idea. I would say myself, because it's the only disappointment in me I can remember, but I tend not to be disappointed in myself to any serious degree. If it's that big a deal I'll do it and do it well. If it's someone else, I barely even notice their disapproval, or I discount it as invalid and uninformed, and promptly forget about it.

Edit: Scratch my last. Last major disappointment was Dan because I took so long about buying UFC Undisputed.