You must be from the old school of civility if you don't get it. Or you're younger and accept it as normal. Civility is now corny. If it ain't mean it ain't funny. Witness the "roast" of Larry the Cable Guy by people he said were his friends. That was my real introduction into the new "funny". Being an old-schooler myself, I thought they were insulting, mean and crass, except for Foxworthy. But people laughed at it.
The times they've done gone and changed on me.
Compare a Dean Martin roast to the drivel they try today. Not even close. Good Point.