Kind of crazy how that goes with old shows. Even shows not so old but aging like Malcolm in the Middle (that I love) have some lines that absolutely don't fly anymore. They aren't funny, they didn't really add anything to the dialogue, or confront a social issue (like All In the Family would). They don't offend me, but they, in this current point in history, rub me the wrong way. Makes me uncomfortable, which is a good thing, as I'm more socially aware. "Hey, not cool to speak that way..."
Right now, the "Zack Morris is trash" videos are pretty popular with good reason. That kid is an animal.