Earlier quoted context omitted.
I must assume you consider it a non-issue because you didn't see a clip of, e.g., the "slope" incident, which is unmistakeably a racial reference. The shot in question makes no sense otherwise. Allowing "clever" references like this continue to signal that it's A-OK to use these terms casually. It is not a non-issue. And I suggest you would not consider it a non-issue if it were the word "nigger".
I did not see it - but I read the Wiki article about his controversies. All of them appear to be no more than play on words, there is never any ill will or desire to humiliate anybody. The reason these particular jokes get noticed is because some people are obsessed with crying foul when certain groups are offended. He could make 10 jokes about the English/Scotts/Welsh and nobody would bat an eyelash.
"...never any ill will or desire to humiliate anybody" - this is the sort of very flimsy faux-naivity that I come to expect in these debates - especially on technical forums with a very literal-thinking crowd.
"He could make 10 jokes about the English/Scotts/Welsh and nobody would bat an eyelash."
Context. You cannot ignore context as much as you try. In the modern day, the English, Scots and Welsh are not typically discriminated against for their racial "traits". Certainly not in any serious way.
Derogatory racial terms are not ok.