The story in UNCANNY XMEN #168 was titled "PROFESSOR X IS A JERK!"
Pictured below, the issue's memorable splash page by
Paul Smith and Bob Wiacek.
But this wasn't the story's original title!
Writer Chris Claremont originally called this story "PROFESSOR X IS A PUTZ!"
But this was vetoed on the grounds that "PUTZ" is a Yiddish word for "PENIS," and Marvel didn't want to call one of their characters a "PENIS" so prominently -- even if it was in Yiddish!
So the word was changed to the more generic put-down "JERK!" Oy vey!