Comedy is extremely situational — first scene in first episode of Buffy The Vampire Slayer made somebody dying funny — so if OP says someone was witty when they did something, they almost certainly were.
I think wit is in the eye of the beholder as well. For the record, wit is typically defined as a form of verbal humor, so it's not really the same thing as situational comedy.
And this might also be a case of one's expectations. If you spent your entire week teaching preschool, and then on the weekend met up with some adults for drinks later, you might come out of that evening with the thought that those were some of the most urbane sophisticated people you'd ever met.
Yeah... because you spend the vast majority of your day preventing toddlers from sticking crayons up their noses. It's the intellectual equivalent of the ebbinghaus illusion.
