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.
Which is why I loved Richard Pryor. He could mock both blacks and whites in a manner they could laugh at it. They would crucify Pryor today for a lot of his material.
Coincidentally, I've been trying to explain the seventies to two of my sons the last couple of days.
I told them that ethnic humor was big in the seventies. There were jokes about every ethnic group.
But we all were proud of whatever we were. We wore it on shirts and hats. For example, t-shirts with "Kiss me, I'm ----" (whatever ethnicity).
It all sounds so strange to young people today.