I get that feeling. It's very upsetting to be the one experiencing it. There are times when I am talking to people and then I realize they aren't listening to anything I'm saying. I will test my perceptions by saying things that don't make sense. I'll even say things like, 'I'm not sure why I'm still talking because I know you aren't listening. I'll just walk away and you won't even notice.' And they don't. Even if we were the only 2 people in the room.