Hmmm, I'll freely admit that I do possess some of the flaws mentioned here - laziness, not giving a shit about the toilet seat, missing the toilet etc etc, but nonetheless I thought I'd add my own personal pet hate - the incredible gift of 20:20 hindsight. Unable to make a call, yet more than happy to criticise the decision made.
"Why did you do that?"
"We had to make a decision, I didn't hear you saying anything"
"But why that, why didn't you do X instead, that would have been much better"
"Why didn't you mention it at the time?
"Errrr...I thought it was obvious"
Navigating in a car, choosing a restaurant, buying...pretty much anything. Nonetheless, it is a pet hate, a peeve, and no more than that.