Now when I think about it, that’s when they started the trend of making all white men on TV look stupid.
You've got a point, but in the seventies (and earlier) it was really all for laughs. Blacks were the butt of jokes, too, but it was all in good fun.
Unfortunately, that newfound openness gave the hardcore left license to weaponize humor against white men and conservatives in general.
The fun has now gone completely out of it. Comedy, and now drama, have become deadly serious activities.