What's It Like?

Today I had a snarky email from a (distant) co-worker, and my immediate thought was to retaliate with something equally biting.  Fortunately (I suppose) I was able to quash the impulse to act on that.

And then I thought, "Wouldn't it be great if it never even crossed my mind to be testy in return for someone else's harsh words?"

What is it like for people who are that good?