I never realized how "politically incorrect" Norm MacDonald was/is, only have always found him funny most of the time. I didn't follow his career and was not watching SNL much in the 1990s when he had the important anchor position for the "news." It's clearly his material, and surprising to me that he got away with it as long as he did. Lorne Michaels has always been a committed change agent of the Frankfurt School type.
He also used to make jokes about crackheads, etc. that would never fly now.