Well, I don't think you've made your point. He says over and over that "common usage" is wrong/stupid/etc.. It being in the dictionary doesn't make it right, by his argument.
That's because his argument is wrong.
Or rather, he isn't making an argument at all—he's simply making assertions. And he isn't giving his opinion, so this isn't really analogous to arguments over whether
Star Trek or
Star Wars is better.
He just says over and over again, "
x doesn't mean
y; it means
z." Inasmuch as we
can determine what words mean, we can evaluate these statements and decide whether they're accurate or not. As goofy pointed out, many of them are not. Now, if he had said, "I don't think
x shouldn't mean
y; it should mean
z," that'd be something else entirely.
The interesting thing is that a few years ago Carlin
said that he probably would've liked to teach linguistics. Though I suppose he probably would've had the prescriptivism beaten out of him.