"Not offensive" fucking narcissist lol. It doesn't offend the trans community, no, instead it raises one of the biggest problems that 49% of the population has, for which there is no reason beyond that our meritocracy - not all, just ours - operates on sexist principles. If it doesn't offend you you aren't paying attention to what's really important, which of course is always the problem with the sex obsessed.
I mean, it's a good joke, but to call it not offensive is to self identify as male.