Recently I was exposed to a lot of uses of "She don't + infinitive" (3rd person singular + don't), instead of "she doesn't + infinitive" (3rd person singular + doesn't). I'm not sure if it is a mistake or just accepted usage sometimes.
I found it in a very famous songs such as:
"She don't know me" by Bon Jovi
Also in Stan- by Eminem (in 3:04)
But she don't know you like I know you Slim, no one does
She don't know what it was like for people like us growin' up, you gotta call me man
I'll be the biggest fan you'll ever lose
Sincerely yours, Stan, P.S. we should be together too
You can find a lot more by searching in you tube "he don't" or "she don't".