my nephew can`t handle the comedy roasts. it`s alot more fowl than rap ever will be
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I would say that intelligibility has a lot to do with this. In a comedy roast, there is no background noise, and the speakers are clearly understood.
With rap and hip-hop, it is often very difficult or even impossible to determine what they are saying. In addition, there is a lot of obscure slang and patois used, and that also makes it hard to understand.
Nothing really worth the bother is said in rap or hip-hop, so far as I can tell. It is therefore not normally worth the effort to try to decipher it by taping it and going over and over each word syllable by syllable, the way some have done with nonsense songs like "Louie, Louie".
I don't think that comedy roasts offer inspiring and revealing perspectives on existence, either. It does not bother me to hear foul language all that much, but too much of anything is just boring. That is why action films tend to put me to sleep. One exploding car can be exciting, but the fourteenth cannot excite anyone.