I think the main purpose of this song is to clear the confusion and give his take on the black and white diversity in America. There are multiple moments in the song where a black male and a white male express their emotions as if they were representing their races. The musical genre of this song is rap, the genre itself is derives politically from hip hop. It was developed in 1980s as a way of using rap to create a political activism.

In the song, they discussed their stories and the rebuttal from each side. The white male said

Yellin’ “nigga this” and “nigga that”
Call everybody “nigga” and get a nigga mad
As soon as I say “nigga” then everyone react
And wanna swing at me and call me racist ’cause I ain’t black

this basically means that why would black people complain about saying the n-word even though they use it themselves and then the black male responded later in the song with

We shouldn’t say it but we do, and that just what it is
But that don’t mean that you can say it just ’cause you got nigga friends
Nigga, that word was originated for you to keep us under”

He admitted that blacks shouldn’t be using the words as is, but they do and there is a double meaning under when white males say the word and that it was because whites used it originally to undermine blacks. There are also a lot more different situations that they exclaimed in the music relating the the divide between blacks and whites adding different political standpoints and different point of views in general. In the song, they used a beat to keep the music constant throughout the whole song to emphasize the lyrics more than the background.