How does the use of a common word denote a racist?
The person using the word "paki" does so because it is acceptable in their society. Heck, in some societies in the UK it can be acceptable:
www.guardian.co.uk/world/2007/jan/23/race.bigbrother [old grauniad link because it's too late to find something newer.]
The ignorant become hung up on words, everyone else pays attention to actions.
Edit: Another, to go with something above:
www.guardian.co.uk/uk/2004/feb/25/race.world
(Me, I'm not... in any way intoxicated, Wed 22 Aug 2012, 0:44, 1 reply)

Generally speaking, in this country, the history of the last 4 decades of so, the word 'paki' has generally been accompanied by 'fukcing' or a brick through the window.
So, yes, it generally does.
( Amorous Badger NAKED BEA ARTHUR PHOTOS 4U, Wed 22 Aug 2012, 1:04, closed)

"...in this country..." and "...a South African mate...".
Seems you're the xenophobe for assuming another country uses the same racial epithets as yours.
The whole world is not the same as the UK and does not share the same vocabulary.
(Me, I'm not... in any way intoxicated, Wed 22 Aug 2012, 1:24, closed)

^This

(Misery McUglywife an attention seeking sociopathic fuckstain., Thu 23 Aug 2012, 6:20, closed)