So I immediately have to define my technical space in the social aether by bringing up my formal tech training. And the air cleared. The guy's attitude, fortunately, wasn't linked to gender.
I must watch that in myself, to not visibly carry that with me. I hope I don't, especially with people like the Trader Joe's Queen Monitor. Technical competence is something that I just take for granted in those around me. I mentioned that a year ago. Either the people around me are technically competent already, or I train them to a point where I can stand to be around them, or I'm just not around them.