How to get my son to stop speaking like a black person?

its not racist. blacks dont have a culture. what youre describing is called ghetto culture. some call it black culture. and it will make him a really bad person. youll have to provide other influences to your son. or get him out of the environment that is making him act that way. most blacks embrace that destructive culture. have him listen to positive blacks like candace owens, brandan tatum, thomas sowell, larry elder, jesse lee peterson and others like them so he can have good influences. 

In the U.S there is this saying that goes like this "Once you go black, you'll never go back"

It's too late for your son, you're in too deep.

No educated person would give a sausage about Fake third world savage talk.

I think the big problem here is his cultural appropriation, don't you?  He needs to know he's being disrespectful to Black people.

black people have no culture.

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Basketball and football were invented by White people (James Naismith and Walter Camp).

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Soul food is a hodgepodge of Native American and European food. BBQ sauce was invented by English, French and German Americans. Gumbo is cajun. Cornbread is Native American. Chicken fried steak is German/Austrian. Pancakes are Greek. Fried chicken originated from Scotland. Waffles originated from Belgium. Peanut butter was invented by the Incas. Potato chips were invented by a white Englishman named William Kitchiner.

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blues music wouldn't exist without the influence of Celtic music and non-black instruments such as the harmonica (German instrument) and guitar (Spanish instrument). Rock n roll is a fusion of blues and country music. Country music derived from Western which derived from Celtic music. Jazz wouldn't exist without the influence of classical music and the piano (Italian instrument) and saxophone (Belgian instrument). Rap, techno and house music wouldn't exist without the German electronic band Kraftwerk. Music as an art came from Europeans. Europeans created things like counterpoint, written music sheets, music theory, etc. Music became organized and philosophical. European culture spread to the Americas and led to the creation of the many genres we see today such as country, rock, blues, etc. They all originate from Europe.

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The traffic light was invented by a White man named Lester Wire. The original traffic light, based on a semaphore system, had been invented in London in 1868 by John Peake Knight (a White man). Blacks only created a handcrank signal that wasn't even a light.

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The lightbulb was invented in England by a Cornish man named Humphry Davy in 1800.

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lewis latimer only co-created (with Edison) a carbon filament that was only in use for three years until another one was improved by another White man. 

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The telephone was invented by a White man named Elisa Gray (who also invented the synthesizer).

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The first modern air conditioner was invented in 1902 by a White man named Willis Haviland Carrier

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The lawn mower was invented by a White man named Edwin Beard Budding in 1830 in Brimscombe and Thrupp, just outside Stroud, in Gloucestershire, England.

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The architect of the White house was a White man of Irish descent named James Hoban (a slave owner btw).

LOL people end up in jail even those who speak properly but you sound like a racist. If  your son is a decent person, why not leave him alone. 

Spiritually speaking, no place on earth at this time offers a better life. 2 Timothy 3:1 shows that we live in "critical times hard to deal with," and we can expect things will get worse no matter where you live until God changes it.

2 Peter 3:13"  "But there are new heavens and a new earth that we are awaiting according to his (God) promise, and in these righteousness is to dwell." That's the better life!

You should introduce him to cool Asian culture.