Justin bieber Music
Hey guys, I learning english by myself , and i watch youtube videos with english teacher , and see a brazilian teacher talking about bieber's music (Love Yourself ) , about a error in the lycris , the part is
"My mama don't like you and she likes everyone"
she said the correct is
"My mama doesn't like you and she likes everyone"
to be honest i dont see any diference
---Excuses for my gigantic grammatical errors I'm still learning a lot, if someone can help me thank you in advance.

Question

Justin bieber Music
Hey guys, I learning english by myself , and i watch youtube videos  with english teacher  , and see a brazilian teacher talking about bieber's music (Love Yourself ) , about a error in the lycris , the part is 
"My mama don't like you and she likes everyone"
she said the correct is 
"My mama doesn't like you and she likes everyone"
to be honest i dont see any diference
---Excuses for my gigantic grammatical errors I'm still learning a lot, if someone can help me thank you in advance.

Answer

Don't is a shorter way to say 'do not' whilst doesn't is a shorter way to say 'does not'.

You wouldn't really say 'My Mama do not like you', you'd say 'My Mama doesn't like you' so really the song isn't grammatically correct....So the teacher is correct!