One of the elementary school especially bullied me through all 8 grades.
When we met, 20 years later in some company, he repeated the same sentences he uttered as a child.
Some people around us (probably wanting to start a discussion) asked me, "Why don't you answer him?"
"Why would I say anything, when his life is so screwed up, that it would be a shame if I said something to him now".
That was the last time I heard him speak to me.

It's healthy if you have the opportunity to not be in the same environment, with the one you don't want to see everywhere, but in the city where I live, I meet sometimes and it's obvious, I have to be ready to fight back.