Walking on eggshells

This post or rather set of questions have become very sensitive. One is almost always wrong, especially if they happen to be male. 

Mansplaining- is there a women corollary?

All men are trash- is there an opposing corollary?

All men are retards- is there a women corollary?

How are men to navigate the discussions around feminism without appearing to silence women’s voices, appearing to be guilty of mansplaining and so on? 

To put it differently, how are men to be feminists allies?

And finally, what is feminism?