I don't think there's anything wrong with jokes like this... except that they exacerbate an already huge problem.

There were 4 women who graduated with a degree in CS in my class of more than 100 last year. The intro class to CS had almost 50% female enrollment. I watched as women dropped out, one by one, switching to math or other engineering majors, some to science or humanities. They were left out of study groups, judged by their looks publicly and awkwardly, and basically made to feel unwelcome.

I generally hate the privilege crusader SJW attitude, but we NEED more women in CS. It's not good for society to have an environment that discourages women from joining the highest paid major coming out of college. It's worth policing our tone and being extra careful to be strictly professional. If the numbers even out, I doubt it would be such an issue.