Well the sex object factor runs both directions and this is apparent on DA in many cases. The double standard is when a woman makes an overt sexual comment about a male nude it is passed off as nothing.
As for the comment about ugliness, calling a body part ugly can be quite degrading depending upon the person(s) reading or having the comment put forth upon them by another. It is often times a form of bullying and can be quite destructive.
As I noted, your comment about & I paraphrase, ...disgusting, horny male(s)..., asserts that women are incapable of acting in an equivalent manner. Both men and women can and are at times disgusting and horny. As per your description, it would seem such behavior is an exclusively masculine trait. Not to be condescending but I think your 20 years of life give you a relatively small sampling of human behavior by which to make such an assessment.
Incidentally, what you were calling ugly is not a "vag" it is a vulva. The "vag" as so many incorrectly name the vulva, is within the woman's body
and not visible unless one uses a speculum to gain such a view. Simple anatomy and odd that a woman wouldn't realize this.
But I do agree that making overtly sexual comments is unwarranted but keep it fair as both guys and gals do this.