And spilling the Kool Aid on someone means that someone was “dissed” or disrespected in ghetto parlance.
In ghetto culture, the worst thing that can happen to anyone is to be “dissed”. And the response to being “dissed” must be violent, again, according to ghetto cultural norms.
This is, oddly, very similar in spirit to the old "code of honor" among European aristocracy and 19th century American wannabee aristocrats. Failure to resent an insult and respond, if necessary, violently, would result in exclusion from polite society as a man who had lost his honor.
But the old guys went about "defending their honor" in a much more civilied fashion.
http://www.pbs.org/wgbh/amex/duel/sfeature/rulesofdueling.html