Lear started the tread of making fun of white males ala Archie Bunker.
Most viewers didn’t know what they were watching and thought the show was funny.
In reality the show started the downfall of the white male.
The first several seasons of AITF is still very funny. There were plenty of “good” white males on it. It was a satire of the generation gap. Brilliantly written and acted.
White males were being made fun of long before then. One of the cornerstones of western humor is bringing down those in charge. Which is white males. Even if you want to give him the modern version All in the Family was based on a British show.
He capitalized on the trend but he didn't start it. Just look at 'The Honeymooners' (1955) which inspired the Flintstones (1960).