The point Casey is trying to get across is that some things are only funny because that particular subject isn't real to them. Once you've been to a place where the caste system is real, where men rape women because they think it'll cure their aids, where people are killed because of their background (didn't you live through Bosnia?), that once you've seen some shit that stupid veil over the eyes gets lifted.
Back to my original point. It's funny to laugh at a stupid stereotype every once in a while, I'll give ya that. But when it's shoved in your face all the time (and it is, to ignore someones posts is the same as having a 4 person conversation where you can only here 2 people) it's not funny and people do get offended.