>If United, however asks how clean the aircraft was and there was chocolate smeared on my seat they get a 1 out of 5.

Well, but then that is not nit picking anything, it is objectively reporting issues that are real.

From your original post it sounded (to me at least) like you would downrate a hotel because the maid forgot to leave in the bathroom a shower cap. (as opposed to just call service for one, if needed)

BTW I know someone that actually did that, and he was (is) completely bald.