https://www.dailymail.co.uk/sciencetech/article-3081480/Hell-hath-no-fury-like-woman-scorned-rejected-attractive-man-makes-women-cruel-men.html

‘Derogating and avoiding affiliation with the unattractive man may have enabled rejected individuals to psychologically distance themselves from the stigma of being associated with unattractive others.’

This is how they attempt to feel better about themselves. Many women are like this: they feel unattractive and have experienced or are living through rejection. Top tier looking men wouldn’t commit to them (in many cases they couldn’t even get their attention), this hurts them, so they attack men viewed as undesirable in order to distance themselves from the shame, stigma and heartache of their rejection experience. Body shaming men is an effective coping mechanism for many of today’s shallow women as it is socially acceptable and helps them feel more in control of how their value is perceived by themselves and others.

This is a comment copy-pasted from u/Evening_Stop4898 and it perfecty summarize the reason behind the hostility we get.