I don't think that's the case at all. How is the joke on the American if the guy pretending to be Khazak is acting dumb? I've not seen Americans being rude or m

I don't think that's the case at all. How is the joke on the American if the guy pretending to be Khazak is acting dumb? I've not seen Americans being rude or mean or judgmental to the Boat character until he is rude first, so it's not like it's highlighting some immoral or prejudiced behavior. Borat skits seem to be him pretending to be a foreigner and being dumb and obnoxious while his subject looks increasingly uncomfortable. There is no layered irony or subtlety for the most part - it's just the low brow humor of being dumb and awkward to make someone else feel dumb and awkward.