Well, I'm not crazy about baseball myself, but when a meteor's coming in pretty much the exact same way as a fastball, the best joke that the most people will appreciate is having Minus ready to receive that pitch the way one would receive any pitch, with a bat.
The heart of the disagreement is, to me, what ol' Grant was getting at in the unfortunately worded quote in your icon. "I like this thing, so more things should be this thing I like, otherwise I will not like them." Aside from fond feelings for FLCL, there is no reason that bat should be a guitar.