Many posts about this. The bottom line is experienced commenters, some mods and others are making a good effort to do some weeding.

Some Deport, Block, and such.

Unfortunately most of the so-called "alt" sites out there are compromised with little gangs of arrested adolescent and shill commenters.

I've been blocked at BB, being shadow banned at Gateway Pundit right now, can get even one up vote or reply, even after asking.

This truly is an information war at hand.