We've been assured that the translation is faithful save for one minor error ("3 strikeouts (KKK) is a row" should be "...in a row.")
Alright, then. So, the guy celebrated striking out the side after injuring a player. It's kind of shitty—in some dumb, unwritten-rule way—but not I'll-get-back-at-him-for-showboating-by-siccing-the-cartoon-klan-on-him shitty. That's just crazy racist. The cartoonist has apparently since apologized on facebook and the cartoon was pulled from Nate.com.