Stylistically, rap occupies a gray area between speech, prose, poetry, and singing.
Wikipedia.
You could have increased your own awareness if you'd looked it up yourself.
I wouldn't say that singing even enters into the equation.
Yes, I could indeed have looked it up myself... had I been interested in doing so.
You may have educated youself, if you could be bothered to do so.
I suspect your original criticism of rapping was just a silly opportunity to make a stupid comment about rapping, which could have been avoided if you'd looked it up first.
I do keep making these stupid comments, don't I?
If only I had looked it up, I could have avoided looking silly. Oh dear, never mind.
But it seemed to get you quite rattled, didn't it?