nomerci, you have a point there. There was a time I used to use sarcasm, but I guess I overdid it :P so then I flipped over to the other side, that doesn't always serve me too well either. So I guess it has to be a healthy balance of both sweetness, and sarcasm when needed. Because honestly, I've learned there are some people who don't deserve your goodness all the time. I don't mean you should be mean/bad to them either, but with them the best tactic is just keeping your distance, even sarcasm is wasted there :)
And like you say, we should work on not letting people get to us. And yes, eventually karma does catch up to each of us. Good advice :)