Sounds to me like the presenter was trying to play off his mistake. It makes me angry though. I have had it happen a few times where someone refers to me as female (when I was passing almost all the time), and I corrected them, saying I wasn't a woman, and I get the "OH I KNOW LOTS OF TRANSGENDERS." You know, how hard would it be to say "I'm sorry, I didn't look closely enough?" instead of assuming that someone is transgender, first of all, and second of all, continuing to refer to them improperly as if they're unworthy of just being...well, normal. Normal in the sense that no one would ever refer to a cis person as the wrong gender if they realized they made an error. If anything, they tend to overcompensate because they are embarrassed.