It’s also prime example of “ignorance is bliss”. If you don’t recognise when someone talks ‘at’ you, then:
1. That person probably does it too, and
2. It doesn’t irk them
But on a subconscious level, being talked at (even if you don’t realise it’s happening) brings an extremely lonely feeling to the listener. And that feeling only perpetuates the problem. We talk ‘at’ people, because we want to be heard, making the listener feeling unheard, who then talks back ‘at’ the person that was talking ‘at’ them…