I know them as much as the comment above me knows Kanye. Being an asshole is a public persona, and each of those people has been called or referred to as an asshole.

edit: and there are plenty of anecdotal "Kanye is a nice guy when you meet him" stories as well. Evel Knievel sued Kanye and described him as 'vulgar an offensive', after they met he said "I thought he was a wonderful guy and a gentleman":

http://usatoday30.usatoday.com/life/music/news/2007-11-27-ka...