I think the issue is how strongly people are complaining.
For example.
I think we can all agree that sexism is bad, and that in a perfect world your coworker would not be looking at you with "hungry eyes". But the world isn't perfect, and you have a coworker who is attracted to you. Maybe even a bit too flirty.
But then people treat this as if the coworker is a horrible human being rather than maybe just an oblivious or socially awkward person who isn't really trying to cause any sort of harm. And this behavior then gets equated with sexual assault, "violence", and so forth.
The perspective is all skewed. It's not nearly as large of a problem as they're making it out to be. There was a story a while back about a woman who realized her drink (coffee I think) would start tasting strange in the middle of the day so she took it to a lab and had them analyze it. It turns out one of her male coworkers had been ejaculating into it when she walked away. THAT is horrific. Your male coworker being a bit flirty is not nearly on the same level, but people treat it as if it is. And that's where the problems arise.
And you just watch, atleast one person is going to respond to me affronted and imply that I must be arguing that it's ok for unwanted attention, or that I believe it can't cross unacceptable lines. It absolutely can, that's not the point.