He discussing a pet peeve of mine: the Serial Comma.
Much like capitalizing the word president when referring to thePresident, I refuse to abandon the serial comma. In fact, I have great disputes with a colleague and, when he takes out the serial comma, I frequent go back in, redo the final draft, sign it, and then get him to sign it.
The serial comma serves a purpose. Trendy types may abandon it, but the abandon solid culture with it.