What can be done to punish males who leave sexist comments about women on the internet? ?

Cyber Castration.

It’s terrible.  Only sexist comments against men should be allowed.  Hopefully this will one day become reality. 

The trend these days is to cancel any comments as well as any person that says anything contrary to the SJW narrative.  

Repealing the amendments that let everyone vote is just a good idea. Letting the average man and woman vote is a great way to get stupid politics like banning "sexist" speech. 

Saying sexist things on the internet is unfortunate but it's not punishable unless it's a specific threat of violence made against a specific person or specific group of people. The real question you should be asking is, "How can I stop letting inconsequential people affect my emotions and feelings?" 

P.S. Get back into the kitchen and make me a quiche, sweetcheeks! Bwahaha

"What can be done to punish males who leave sexist comments about women on the internet? ?"

Thankfully, nothing.  Only in totalitarian countries is such frivolous speech and personal opinion controlled the way you would like it to be.  Of course, those that call for such totalitarian action have no actual conception that they will be just as controlled with their speech and behaviours as well.

Go examine North Korea to see what I'm talking about.  I'll bet nobody there is talking about repealing women's voting rights.  Ironically, nobody in that country has voting rights.  You see how it works??

.

Typical Karen, wants to censer anything she doesn't agree with or hurts her feelings.

Its hard to find out who these creeps are in the real world so not much can be done, unfortunately 

Lol punish them? Who cares, men say dumb stuff frequently. Ignore it or let them know what you think. No need for punishment Atilla. 

Nothing. Some people need to quit being hyper sensitive