Answer:
It means to not hate your children. So don't hate your children they love you!
"When I said you were a friend of Tom's, he started to abandon the whole idea. He doesn't know very much about Tom, though he says he's read a Chicago paper for years just on the chance of catching a glimpse of Daisy's name" (p.152)
I’m guessing critical listening since you’re critically aware of overgeneralization and you’re asking questions sorry if this is wrong
The main idea is basically that anyone, no matter what they're believed to have done, deserves to be considered by a non-biased group of citizens.