We know. However some will contend that, for example, 'k' is not a colour but an attitude and they will get arrested and chastised for making such 'jokes'.
Everyone should be equal - if we can't insult black people we should't be allowd to insult Afrikaaners either.
The ad was hardly insulting, ppl need to harden up a little, otherwise this is gonna turn into the states where ppl are getting sued for absolutely everything...
If we cant see at least some humour in each other, we are going done a very dangerous slope