None of them. To sound fuddy-duddy and old-fashioned: I believe the Simpsons are teaching children that sarcasm and disrespect are the way to treat adults, and one another. I think they are teaching adults to expect that sarcasm and disrespect from children, and give them back.  In short, I think that show, among others, is increasing the rudeness factor in our society.

I long for the days of Tim Conway and Bill Cosby, when humor was funny, not a series of put-downs.