Most probably, you mean like raw instruments right? Thing is, rap beats are typically a mix of all different types of instruments and electric instruments. What's different about Hip-Hop beats is they tend to be a mix up, a mash up so to say, of multiple different sounds and noises from instruments (normal and electric) all formed to complete an instrumental - sometimes a loop used to create a rhythmic effect. Whereas in genres like rock, the actual music is down to one or a handful of instruments so the actual instruments are more recognisable as they are one of the main focal points.
And you asserted my question on why I don't like rap.