I’m not knowing whether this sentence/phrase was used or not without not adding any contextual clues, nor have I heard it before.

Technically, the sentence “My mama don’t like you, but she likes everyone” is immature: the use of don’t instead of does’t for the third person singular is, in my experience, pretty common slang. Many people think “doesn’t” has too many syllables. Why should “didn’t” instead of “don’t” is correct(it has too many syllables) and creates an inconsistent verb tense like the rest of the song.

How do I say it isn’t true?

Why do people say that it’s wrong to slug everyone and go along with it?!