As I've answered this a few times now, it'll always be : The Hunt !
Dear Otis,
I can't say this is a favorite, but in 1962 Serling wrote an episode on hate-mongering...title HE'S ALIVE.
Unfortunately that episode never seems to go out of date, still timely for us now in 2016.
And they have it on YouTube...really shows the genius Serling was.