Personally I wouldn't even care. The way I look at it, if they are talking about me, then they are leaving someone else alone. Plus if they are talking bad about me, then they aren't truly my friend anyway. If I found out, I wouldn't even get mad. God only knows how many people I have kicked to the curb over bad blood. That's the cool part about being able to turn off your emotions like a light switch. Most of the time you just don't care.