Hey thank you for what is by far the most complete answer. Only a few people who responded actually answered why.
Here's a good example.
https://www.youtube.com/watch?v=Soc5_lQVsGM
He's obviously mocking niggers while ad libing the most ridiculous nonsense possible. He does a pretty good job of aping how black people talk and drawing your attention to how stupid and childish their culture is. The actress starts cracking up at "they call me pink dress" because the things he's saying are just so stupid. The longer he keeps going the harder it is for her to maintain her composure.
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