As a former English teacher, I can assure you that very few people (except the extremely learned posters on this forum) get the homophone or apostrophe things. It was torture to teach these and to try to think of ways to get kids to remember the rules for these things.
My husband used to say "He don't" instead of "He doesn't" when we first met. I realized it was because his parents said it, so I just came out and said it sounded ignorant and wasn't proper English.
He never used it again.