"And to claim that the only interpretation of the use of the slang term "your boy" is racist, is pure bullshit"

Yes, you are correct. It is not the *only* intepretation. But it is one that is so offensive, that any person who truly wished to engage in civilized discussion would not use the phrase.

It is true that the word "spade" has several meanings, as does the word "chink". But grown-up non-trolls are careful to use these words only in a context where their innocuous meaning is clearly intended.