Why Do People Get So Defensive?

The Gamorah says, "Why are your fingers shaped like pegs? So if you hear Lashon Hara, you can put them in your ears." Why is the little fleshy part of your ear flexible? So if you hear Lashon Hara, you can put it in your ear. What do I need either one of those two methods for? Just walk away. Ideally, if you hear Lashon Hara, you should walk away, but you don't always have that option. So if a people are speaking straight Lashon Hara, put your fingers in your ear because you're making a macha. This is wrong and I don't want to hear this. I have never seen anybody respond well when someone says, "I think that's Lashon Hara." Usually, they get angry. Oh, when you do everything right and you never do anything wrong and you are such a tzaddik, I don't know what it is. People become very defensive.