Not exactly, but something similar happened to me the other night.
I just switched gyms a couple months ago and this other BBer is always there the same time as me (but he's much larger). Anyway, I never talked to him before, but wanted a spot for my last set up squats, so I asked him to give me a spot.
I get through my set and say thanks, and he says "it's cool, I kind of thought you had too much weight on there and I'd have to lift it all for you, but that was all you bro."....
Then we talked for a couple mins.
Flash forward to end of the night.
I'm leaving and he's up front spitting game to one of the PT's. So I just walk by say:
ME:Thanks again, *name
HIM:Any time, you seem alright, ...now
ME: (jokingly) Oh but not before?
HIM:Well, actually, I thought you were always mean-mugging me before and you looked like you thought your were a badass or something.
ME:Seriously? my bad (laughing)
HIM:Well, even after we talked for a bit, you still had that same look on your face, so maybe thats just your look when you're in training mode
ME:Oh, proabaly, my bad bro.
HIM:It's cool man. When I'm in the zone, I probably look like an a-hole too!
ME:haha