Two musicians come to mind--
Howlin' Wolf--saw him play more than a few times, he seemed resentful of the audience most of the time, but he sure gave a great performance. Twice I saw him play with Willie Dixon on bass, Willie was one of the warmest performers I have ever experienced.
Leo Kottke--Outright rude to many audience members, though some of the audience members may have exacerbated the situation. He is, without a doubt, a perfectionist within his own standard , and a fine guitarist.
BTW, John Fahey overrated? Hmmm...Not in my book.