[onli]

It is not offensive at all (i agree it is bad taste, though i didn't understand the joke).

It is sexism if you understand sexism and genderism in its strictest sense: That there is no difference between man and woman - sex is a thing imposed by society - and mentioning things like the penis, the biological difference between man and woman, constructs that change, thus is sexism.

Yeah, as crazy as it sounds.