What artists attract the most intelligent/kind/fun fanbases? I'd have to say:
His politics and parodies and such make him a very complex artist to approach, so those who remain imho are those who are more persistent and willing to try over and over with things they don't love at first.
The Flaming Lips
The live show dress-ups prove the carefree attitude of the fans.
Those are the only ones who come to mind. What other fanbases are generally open-minded people who are less likely to force their favorites down your throat though they are still loyal to the band a la those "bad" fanbases?