He doesn't like it because it is the closest yeast to being self-aware. One time when he was using it in a particularly strong barleywine it crawled out of the fermenter and attacked him, tried to drag him back in. He just managed to reach a spray bottle of purisan and fight it off, otherwise he'd be just another statistic. He won't touch the stuff ever since.
All of those stories you hear about people "falling into fermenters and dying"? Chico. The stuff is vicious.