I agree...Even talking to some people who hold these ideas feels like talking with someone who is not there. Or talking to a piece of soap. (I think you get what I mean with that ;)
I sometimes reply or talk in the same manner as they do, to point something out. Don't know if it's always effective though, could be too subtle or look like I agree with them. It's hard in the written word.

What's up with these comments, the first looks like s/he is talking about something
But the second is weird, and like a copy, but with other words.......strange.

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