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.
Think about why is it demeaning to call a man a ‘sissy’. What is that comparing him to?
And calling a man a cuck is emasculating because it implies he is weaker than, and controlled by, who?