Our expert says:
I talk to myself, too. At times. And usually I'm friendly. Lip moving, or even thinking it clearly, without sound, is maybe commonest ; and rehearsing a possible con versation or statement, all very normal.
And how much healthier to silently mouth what you'd like to say to someone who has angered you ( so long as they're not good at lip-reading !) rather than saying it aloud and getting into a fight.
Now, if you start arguing with yourself, that may be less useful. I don't think most peopl would think it dotty --- like nose-picking, it's something most people do, privately, and only make any fuss about when someone else does it.
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