What made me soften my tone long ago was an encounter with a workplace bully. He decided to come after me, so I responded. I was good, and I really hurt that man. Not physically, but I could figure out the things to say that would hurt him most.
He got so depressed that his doctors had to intervene because he became suicidal (I was told by a coworker that he was that bad off).
Did I learn from that? Yes. You'll find that the absolute worst thing I do around here is snark. Most of it is self-effacing, and I never say anything to actually hurt someone.