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There was some sort of formalised conflict between hiphop and rock. I remember a film with RunDMC, really low budget, where they were battling heavy rockers whose leader was played by Rick Rubin who was the producer of RUNDMC's records. He made records for both Slayer, Public Enemy, the Cult, Danzig and Beastie Boys. ANd they all learned and sampled from each other :)

Walk This Way was one of the first big crossover records for rap and rock. Then we had lots or rapping rock bands. Music evolves. I tend not to say that I hate any particular genre as there may be stuff I like. Rick Rubin is an interesting guy as he's not a musician and not into the technology of recording, but he's produced loads of acts.