> telling a coworker you are attracted to them, guess what, it's not sexual harassment,

It's really disappointing to see people defending vile behaviour on HN, and is the reason I normally flag these threads.

> Personally, I'm not willing to "err" on the side of pretending my coworkers are ethereal beings without corporeal form.

You've set up some bizarre distortion of what you're being asked to do, which is very simply "don't comment on a person's appearance unless you know that person well enough to do so (and almost certainly never if they're a work colleague).