Couple guys have nailed it already. People don't want to take responsibility for the actions of their children anymore. Somewhere along the line it became the norm or commonplace to say that the television they were watching was too violent and giving them bad ideas. Wrong. When a child has bad behavior or racist ideas or is sexist, it's because you didn't do your job as a parent. Plain and simple. I watched all the old cartoons, and I was never a bad child. I'm not sexist, I'm not racist, and I knew the difference between cartoons and real life. Problem is, the TV companies were having all kinds of problems with the group of people who decided this was bad TV, so they just stopped airing the cartoons.
As far as new cartoons go, my children won't be watching that stupid crap. My children will learn important life lessons from me, not some stupid cartoon. As far as my own enjoyment, I've bought some of the old cartoons on DVD and watch them from time to time, and they are as funny now as they were 25 years ago when I started watching them.