In the first place, so much of the aesthetic is based on gangster culture. Black gangster culture specifically. Based off of the actual real problem of black violent gang culture . How can that be considered good in any way?. And the music itself is low class, simplistic and has no real melody. i don't know why anyone likes it to be honest.
And White or Asian people copying it are worshipping black gangster culture because so much of hiphop and rap is based around that. Just look at the lyrics and music videos and what the "singers" wear and how they conduct themselves. All the tattoos , too many metal piercings, stupid amounts of jewelry (again , its based off of materialistic gang culture) just all around uglyness , rude gestures and behaviors, trashy . In general its all just vulgar.
And why is something that was invented decades ago always promoted like its "cool and modern"?
Its not good or bad, its just a thing that exists that people can make good or bad from. The Jews are the ones that took the gutter trash form of it and made it the primary association people have with it, which is a form of manipulation they use on everything.
I don't really care for rap that much that I'll die saying its an underrated wonderform, the point is that the techniques used on it are easier to see because of how blatant it is. And learning to see those is important to combat it on more important stages.