Bwahahaha. I became his unsolicited editor only to piss him off. You can’t “teach” Bob. Bob ain’t gonna learn! 
But in all honesty I do notice a person’s writing. I have a fascination with language and one of my habits is to proofread what I write. I can be a real nerd about it. I even have a favorite punctuation mark: commas. They’re the sexiest of all the punctuation marks because they control the flow of your writing and one has to think about when and where to place them. And for anyone …but especially guys…who have that awareness…it is oh-soo-hawttt!!! 