Why Writers Writing on Writing Are Paranoid

At the end of a very critical review in The Spectator of John Cleese’s autobiography:

Gosh it’s dull, this book — a dreary combination of pompous self-congratulation and tetchy sarcasm! . . . [T]he only time I laughed was at a grammatical error (‘Like Graham and I, Michael and Terry, and Eric were primarily writers’).

Not every writer is a good grammarian, but still.