I've never said I've faced racism in the same way as those of darker skin.
As for the word Pakistan, I've known plenty of Pakistanis who find the word funny, and say... I am a Paki, it's my culture nd ancestry. They (well my neighbors at work) say, what I find dumb, is when people say to me... Have you got any Indian recipes.. stupid wankers, I'm a Paki (direct quote from her)
So yeah, some find the word,.or words offensice, others take it with a pinch of salt.
I've joked with them at work, like I would any other colleague, and vice-versa. It's included words neither of us, would use outside of work and away from each other, but that's cos we know some may be offended. Any one who has worked in a call center knows the honour is a bit ripe!