The comedians themselves are contradicting you.
Re-watch many comedians from the 80s and 90s and they're just being close-minded rather than actually being funny.
The worst I remember was when in the office we'd all call each other gay for silly things. "You not coming out tonight drinking? Are you gay?".
Then we hired a homosexual.
For months we still all made 'gay' jokes. He said he didn't mind. They would just slip out, that's how we talked to each other. "ah man, who would write a function like that? It's so gay!".
I still feel ashamed today thinking back on actually how hostile that workplace actually was to him. Even if he really didn't care, we were still basically constantly saying Gay Is Wrong. We were idiots. We were wrong.
It's not being sensitive, it's simply being close-minded.
Obviously not a Carlin fan! Its very easy to be open-minded and completely insensitive. Emotional sensitivity is not a desirable attribute, despite its current popularity.
Totally agreed that societal mores change over time and you can retroactively realize that something wasn't OK.
The guilt, along with his confrontation with the other Nexuses and the (ambiguous) realization he's the one doing the dangerous work because he too is not a person, is what changes him.
Most contemporary writing feels like cotton candy that dissolves easily in the mind, when compared to the rack of lamb you take in from Carlyle.