Yeah, that's silly. I can tell by your demeanor you're a woman. There's nothing to suggest otherwise. It's hard for a guy to fake. He obviously wanted to see what you looked like and find out your age.
This person was the opposite, he had a pic and age listed and would post pics of young women in bikini or halter tops, or belly shirts which were kinda cute and flirty, and the caption would be "what if this were your daughter?" Or "what if this were your daughter and her breasts popped out?" And as I said in the comments, I know some young women have daddy issues, which is understandable, but this appeared to be a guy w daughter issues, which is something else entirely. Again, pretty creepy.