a lot of guys don't like slapping, I think it's because it was completely over done during the 90's funk/disco revival. Due in part to bands like Jamiroquai, Brand New Heavies, JTQ! I was part of that scene (be it a small part) and every kid in every band was slapping and popping roots and octaves (including me at the time) thinking it was the only way to be funky. In a lot of kids minds, if you didn't slap, then you wasn't any good. When I got older and learned better, I pretty much refused to play slap, I got into playing harmonics, and chords, and just felt that if you could be funky without slapping, then it would make you stand out a bit more, and it did... I've just started playing a bit of slap again and I forgot how fun it is. every thing in moderation I think.
but hey everyone is entitled to their opinion, that's just mine!