Everyone in my family thought that my sister was bipolar because she was always throwing the worst temper tantrums. She would go deep off into her beliefs and no one could argue with her. I was always the peace maker and guy who was rational. Of course, the most non-rational thing happened when I became manic, then psychotic, and now I'm diagnosed as bipolar. I hardly think attitude has much to do with it. Unless of course depressed or raging manic.