Umm wow, I kinda don't think that joke between the students is funny. I think sometimes humor is a way to get out of tension/stress. Muslims are under a lot of tension/stress/scared at the airport so they 'joke' about the situation to dispell it or to try to make it seem like everythings ok.
The other thing ppl do is take deragatory terms and try to make it their own in defiance of it's use by others... ie black ppl calling each other 'nigga' etc.
See, that's what I mean - to other people they're like 'ummmm WHAT??' but in the context, if you knew the guy, it was a funny joke.
I guess that what I was thinking is, is making that kind of joke 'okay'?