> virtually everyone I've ever seen make a strong argument against "DEI" ended up having (...) men's rights

So people who dislike a cultural type of discrimination also dislike practical discrimination against men? People who dislike what is going on in general, also have practical opinions how the situation could be improved in practice, how to make the situation more fair?

This is akin to being surprised that people who are actively against animal abuse are also helping animal shelters.