>Because you are implying it's a bad thing.
Where did I imply that? If you go back one clause, I explicitly said that there can be disagreement on if it is a bad thing or not. [0]
I do not know how my opinion came across, but I believe this should make it clear that I am at least open to the possibility that the behavior under discussion is good behavior. [0]
>You can't just take away the context of the conversation and pretend that we are arguing about semantics.
What context? I was replying to a post describing his approach to avoid "overstepping with women" [2] and how "it's really not all that difficult". In doing so, I was pointing out how non obvious the solution was.
If a central tenet of your approach is "don't be sexist", and you proceed to make recommendations that are, on their face, sexist, it is not just a matter of semantics to point this out. It means that the standard of "don't be sexist" is seemingly useless because I cannot determine what types of technically sexist behavior don't count as actually sexist unless I have some independent test of what is acceptable. If I do have an independent test, then why bother saying don't be sexist, when you can just say to use my independent test of acceptability.
>For example, women are physically weaker than men, so if a man was to hit a woman in public, he would be arrested, where as if a woman was to hit a man in public, no one would blink an eye.
At this point, I hope I have made it clear that there exists (in my opinion) good sexism and bad sexism. I feel confident is saying that this is, unambiguously, bad sexism. [1] Women are not so week that they are incapable of committing assault; or that there is no damage done to the victim when they do so.
[0] To clarify my position somewhat, I have no idea if it is good behavior or not. In an ideal world, it would be bad behavior, and it has easy to articulate downsides. However, it has potential upsides of reducing bad sexism. I do not have the tools necessary to make a confident decision on the net effect.
[1] Or rather, the double standard you describe. Your observation itself, while potentially overstated, is simply a non sexist observation of sexist behavior. Or maybe the observation itself is biased by the sexism of the observer; again I do not have the tools to determine that.
[2] Pulled directly from from the submission title to avoid editorializing.