First of all, they shouldn't be recognized as "artists", they should be known as entertainers or clowns. They dress themselves with outrageous rags, and only "rap/sing" about complete idiotic ideas or events.
Second, yes, they should speak like a normal person would, but I understand this isn't possible as most hip hop/rap "artists" speak in African American Vernacular English or Ebonics. I am aware that there are some white rappers that speak in the same dialect.
Third, most real artists don't sing about the world being "peachy". I don't know what you are talking about...
Have a good day