I agree -- Left, Right, or Moderate -- and especially when you have asked a question in your 'attack' meme.
If a meme maker does not want to see comments running contrary to the political narrative, then start blocking those particular posters. Eventually all that will be left that the meme-maker can 'see' will be like minded individuals waxing poetic about the courageous brilliance of the memes. It's a win-win situation!