The situation is totally different in the UK where the word Paki is commonly known as a very racist term.
This is still a problem because it is often thought of by the older generations as just a short form of Pakistani. I've even heard Asians refer to a 'corner shop' as a 'paki' shop.
I think the problem with 'murzyn' is that it is like 'negro', not necessarily a racist word but rather out-of-date. Murzyn is from the word 'Moor' and not all Blacks are Moorish.
I might agree if it would be "Murzynek Sambo"
In UK the Russian martial art SAMBO (a term based on the Russian version of samo-obrona) is called SOMBO because it might offend people if it had a racist name like SAMBO. Of course, nobody worries about offending the Russians.
Its just a term used by ghetto people as far as I can see, Ive heard a few WIGGAS use it in the UK...It just makes me cringe when I hear anyone use it.... Nignog used to the word of the day back in the 70s in the UK, this was offensive towards blacks though.
The thing about the word 'nigger' is that it is derived from 'negro' and was used as an insult. The Black community in US started using the word 'to reclaim it' (a bit like how the Gay community now use the term 'queer', which was originally an insult). That Blacks can use the term is controversial even amongst Blacks (and can be used as an insult as well)/
nignog previously had the meaning of someone who was inexperienced, particularly used in the army. Even today they'll use the term 'nig' for a rookie or young soldier.