sp - Why do racists think they can get away with it?
In asking that question, you are assuming that any racist has the mental capacity to think beyond their immediate knee-jerk reactions, and to care what other people think about them, and what they say.
In both instances, you are elevating the standard racist to levels which he can never achieve, since both require a level of intelligence and empathy of which he is incapable.
As pointed out, this kind of nasty behaviour pervades every football match, I am unsure why this particular instance has been singled out for coverage.
That is not for one moment to condone or excuse what appears to have gone on - merely to wonder why this incident is being analysed and debated.