Uh, I've seen the thread title. Telling people who agree with him come here doesn't carry the assumption that those who don't agree with him shouldn't come altogether.
In short, he's telling people who agree to come. People who share his opinion. He doesn't mention anything about those who disagree. That wasn't implied nor insinuated.
When you go out in public, and go to the restrooms, do you see the sign labelled 'Women' as simply, "Women are encouraged to go here, but nobody else has to stay out"?