The butt of the joke is the person asking the questions because they look like a creap/pervert/overly horny.

Sure, but people explicitly use the excuse of "it was just a joke" to cover for bigotry and to (successfully) move the Overton Window right.

On the internet, it's a coin toss as to whether or not the person posting that was poking fun at themself (or a fictional version of themself) like you say