Can't say I have faced any. BUT...
It's not the apparent racism, it's the talk that goes on in the office when something happens in the world (like something stupid done by MOSLEMS) that makes me uncomfortable. I know they are not pointing at me, but someone brings up the topic, everyone talks. I myself take part in some discussions like "Did you hear China is banning all cars coming into the city a week before Olympics", so I can't say that talking about world events at work is wrong.
But what can I even say if someone brings up the Danish cartoon incident and the violent protests in Karachi? There are only so many times one can say "Those people do not represent the true spirit of Islam, and are completely wrong".
And while I am at it, I understand the Westerners living in Muslim countries during those times must have felt the same discomfort, with people asking strange questions, giving strange looks and maybe some even tried to be apologetic. I feel for them. It's not their fault what happens back home, they have no control over the events. Just like I don't have any control over the events in Karachi.
Although, no one at work brought up that topic while those events were happening. So no one said anything.
I can totally relate. I feel the same. Most people are quite courteous and I try to model positive behaviour - but sometimes you just know they're itching to say something.
PSquared, your dad is right. :)