Yes, I think I hear you, Motts.

Maybe their ADD comment caught you off guard and triggered annoyed feelings in you as well, but rather than respond defensively causing a possible 'fracas', you opted to just go along with it to keep things cool, which is probably quite common actually. BUT going along with it obviously meant validating the ADD comment too, and, so, that's where, in the spur of the moment, you volunteered the tidbit of personal info. It was, in the end, a sort of 'snowball effect', if you will. That's basically why I think the situation happened the way you described = you just wanted to keep things peaceful.