I am sorry, but getting worked up over this is absolutely ridiculous. And I say this as someone who lost his father to cancer, and had cancer affect most of my family.
Newsflash: I bet that trashtalk in the NBA also involves misogyny, racially insensitive remarks (including the N word), ageism, and that more than a few players use handicapped people or the mentally retarded to make fun of others.
It is trash talk. It is taking place between two grown men. It was not done publicly.
KG shouldn't even have to apologize for this crap.
And if you think he does, well, please apologize for all the times you used insensitive words in private. Apologize for all the times you watched south park and laughed at the jokes they make at the expense of the mentally retarded, physically handicapped, the poor, and hungry, and so on. Apologize for every time you called someone retarded or any other word associated with any disease or mental condition.