if you really didn't intend to say something that made someone feel disrespected, your response should be "Oh, I am so sorry, I won't make that kind of comment in the future", not "Well you're wrong for being offended." that kind of response is basically saying "your feelings don't matter, all that matters is what is going on in my head and not what I actually did and how it actually made you feel"
You'll find that the U.S.A's EEOC does not label one-off remarks as sexual harassment.[0]
[0]https://en.wikipedia.org/wiki/Sexual_harassment#EEOC_Definit...
And is the primary authority's (EEOC) definition of harassment in general: Offensive conduct may include, but is not limited to, offensive jokes, slurs, epithets or name calling, physical assaults or threats, intimidation, ridicule or mockery, insults or put-downs, offensive objects or pictures, and interference with work performance.[1]
Neither of which make the remark in-question constitute of sexual harassment or harassment in-general. I'm sure there is a proper word that accurately describes unwanted remarks about a person's body, but by calling it sexual harassment you are marginalizing the serious cases of sexual harassment that fit under the legal definition.
[0]https://www.eeoc.gov/laws/types/sexual_harassment.cfm [1]https://www.eeoc.gov/laws/types/harassment.cfm
That said, I acknowledge it's very situational whether something might be read as unwelcome. Which is why avoiding these things in a professional context seems pretty wise.
Anyway, since we're replying here to door's comment... I think they're right regardless of whether we want to call it "sexual harassment". If you offend someone in a way which feels creepy / harassing to them, even assuming that you absolutely meant it in a non-sexual non-flirtatious entirely-platonic matter, your should apologize, maybe clarify your intentions, and say you'll do better in the future. Attempting to argue that you didn't mean it that way so they shouldn't be offended is counterproductive.
My only gripe was with semantics, which have the potential to do more harm than good.