The only term I could think of is defeminization.
It seems like most people understand what emasculation is and the things that cause it.
What are some examples of situations that can cause the feeling?
Edit: changed effeminization to defeminization.
body shaming. making fun of small boobs, big boobs, uneven boobs, put your nipples away, etc. you’re always too skinny or too fat. the perception that women need to be protected.