Do you really believe explicit, credible death and/or rape threats for being a woman with opinions on Marvel movies or games or being LGBQ are examples of a non-discriminatory environment?
Edit: The point being that the mailman is a red herring. If the internet is really an extension of public space as (presumably) claimed, let's treat it like one.
In my country, I can open a police report for online harassment.
We are now in an endless debate. Internet isn't the problem. Bad behaviours, uneducation, missinformation, fake news, etc are the problem. Blaming internet won't solve those. And they will be ready for the next tool.
So think carefully when you ask for this kind of environment. I think what some people are actually asking for when they say "non-discriminatory" is an environment where people who do not accept minority members or opinions are not welcomed.
These are not the same thing.
What about convictions that compel action (Jihadis, Jehovas, militant atheists, Nazis) it might serve to eject people of those convictions because it should be expected they take those actions.
It is like asking for bullets which only hurt guilty people whom it would be necessary to shoot.
Death and rape threads on the intertubes is just people being mean.
Deal with it, there will always be somebody who hates you. Life's tough.
It doesn't have to be.