I'll take a swing at this...with the note that something can be 'mildly sexist'. Sexist, without being a four alarm fire. The problem is it feeds pretty heavil

I'll take a swing at this...with the note that something can be 'mildly sexist'. Sexist, without being a four alarm fire. The problem is it feeds pretty heavily into the notion of "Male as Default" and that when you're talking to a tech audience, you're talking exclusively to guys. The thing being discussed, compared to, etc. is supposed to be a common experience, something that you've actually thought about, or at least would go "Yeah, that is weird..." For half the population, urinals are not so much something they interact with. By assuming it's a common experience, you're assuming the reader is male.