I would have asked him what he meant by that, but it wouldn't have been the first person I would have had to roll my eyes at later on for being a not so bright-bright person who sticks their foot in their mouth.
Assumptions happen all over the place though, I experience it regularily being a SAHM when dealing with public school educators. They assume they need to talk to me like I'm 10 so I'll understand, when really I hold several more degrees than they do wink