In "She's Madonna" Robbie Williams sings:
I love you, baby
But face it, she's Madonna
No man on earth
Would say that he don't want her
I've read English books, watched movies, listened to people for over three decades now and I don't understand why "he don't want her" was written instead of "doesn't want her".
I can explain it only due to the way "don't" and "doesn't" are pronounced. The former sounds lighter and faster than the latter. Is this the reason? Still, it's confusing.