Someone says, "Whatever."

For years, I have hated it when someone says, "Whatever." I never thought about it, or even realized it bothered me until my ex-father-in-law would say it to me. Why did this simple one-word-statement bother me so much? I think it's because it's an attempt to negate everything you've just said. It says to me, "I'm not open to what you've just said, and I won't listen to anything else you say. You're an idiot, and there's no educating you to my superior way of thinking. So I'm going to just say, 'Whatever,' and sit here smugly. He might as well say, "I give up talking to you. You aren't worth my breath or my time."