The only two forms of music I don’t like are jazz and rap. Rap isn’t music, it noise. Oddly enough though I took lesson from one of the premier jazz drummers ever, the late Joe Morello.
I liked jazz when I was much younger but it got WAY OUT THERE for me. I didn't "get it" anymore. The only name I can even remember in that genre is John Coltrane.
You are correct: rap isn't music. It's talking to a rhythm. Nothing more.
Rhyming isn't difficult. Even children can do that.