Hi. I'd like to ask native English speakers: how would you explain the usage of "don't" form with she/he/it? For instance, I came across this in the song "Colors" by Halsey. Here is that part in lyrics:

Everything is grey 

His hair, his smoke, his dreams 

And now he's so devoid of color 

He don’t know what it means 

And he's blue 

And he's blue

Is it gramatically correct?

Who really wants to have a long-term English-Russian exchange?

I've written to many people proposing to learn languages together, but no one answers. 

I am ready to talk to you every day at least an hour in Russian and will do my best to improve your language skills regardless of your level (even if you learn from scratch). Practicing through voice and video calls are preferable, because it gives the best results in the end. I'm quite shy, too, as many of the users here probably, and don't bite. So those native English speakers who are ready to speak with me in English as well, please contact me.