Men generally do not welcome women into their discussions, because if the aesthetic of something we say seems displeasing to you, you will object to it and derail the conversation, without an understanding of what's being said is rooted in at the structural level.

Then instead of discussing the matter at hand, the subject shifts to whatever it is you've misunderstood and have deemed unethical or become scared of, and now great pains must be taken to soothe your fears and explain the inaccuracy of your presumptions. This is a drain.

This is why, I must say quite emphatically, despite your nosiness and curiosity, you are most unwelcome. You are unwelcome not because we hate you, but because you make communication more difficult, because your neuroticism interjects, filibusters and degrades the discourse.

Men don't want to babysit all the time.

Having discussions which require rigorous thinking necessarily excludes all forms of emotional hand-holding, which is a mandatory requirement for women to participate.

This is why we like you to leave us alone.

Respect our wishes.