It's clear that your jaded by your own opinion of the man and have some sensationlized idea about why others didn't like him. I'm positive that there were plenty white supremacists (not sure why you're using capitals for that term) and war mongers that hated him and I can asure you if they are those things they still do, but to overgeneralize and say that is the only people is extremely short sighted. It's quite apparent your opinion of Ali is formulated from a Will Smith interpretation of him.
I would say his comment just as much an over generalization (not sure how you can OVER generalize something) as your initial comment was. (only his was funnier)