Thinking everyone you disagree with should be silenced and not allowed in is literally what fascists do. It's what the nazis did. How very "progressive" of you.
Everyone should be allowed to express their opinions and beliefs. Everyone, no matter how much you disagree with them. The onus should be on you to simply not engage with any that you don't want to, be that by simply ignoring them or by using the built in tools of the platform like blocking/ignoring. You're literally asking for censorship of speech.