Not really. I feel like it's not healthy for any community if all the people you don't like aren't there to offer their viewpoint. The more you build an echo chamber with no dissenting opinions, the more extreme it becomes and the less it's able to deal with things that clash with it's ideals. The less it's involved with things that clash with it's ideals.
-This does not include groups with completely bad faith arguments that are clearly racist bigots.