No, I've no idea what Uncle Tom means. Haven't the foggiest what Choc Ice means and anybody referring to any one else in those terms has no racist undertones at all. It's just friendly banter, nay, slang.

And if I call the local black guy a nigger he can't have me done because he can't prove what context I was using it in.

I don't know what I was thinking.

Thanks for the edumacation.