The following is pure opinion on my part, so please don't get over-emotional with what I say...
I put slap in the same category as rap (and not because they rhyme). They have both provided a wonderful opportunity for people with no knowledge of music to enter the music world.
Playing actual notes (arpeggios, different modes, etc) on the fretboard requires knowledge,
whereas any 15 year old can grab a bass and pound the hell out of it like a monkey in their feeble attempt to try and impress other humans. Same with rap....any 15 year old can grab a microphone and yell "yo" into it 182 times and convince himself that he is a musician, despite the fact that he has no singing talent whatsoever (unless of course he wears a baseball cap sideways, which is a skill that takes years to develop!

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Knowledge of music requires work and study....two things that many humans don't want to do. So they look for the easiest, shortest, quickest (and laziest) path in their effort to try and impress other humans.
I agree with the other posters in this thread who said that when they click on a youtube vid for a review of music gear and see some wankoff spending most of the time wanking instead of actually showcasing the gear, I immediately think "what a monkey" and I exit the vid muy pronto.
Again, this is just my opinion. It carries no weight. So relax. If your opinion differs from mine, I'm happy for you.