No one has suggested it should.
“Man” and “woman” are terms of ascribed gender, which until recently was usually ascribed based on assessment of genitalia at birth (“biological sex” is a different though related issue) and considered immutable, but is now, in most of the developed West (despite usually being still initially assessed by genitalia at birth) held as something which should be adjusted to align with gender identity.
> but that shouldn't force me to change my behavio
Obviously, no one (on HN) is forcing you to abandon the retrograde and transphobic behavior of misgendering individuals based on imposing your personal preference for how and on what basis they should be gendered over their gender identity.
Calling it out, sure. Forcing you to change, no.