Rude passengers?
I fail to understand why particularly arab or Indian pax, and it is not as flyblue says about thought police being behind you when you mention it, but more of what we are not used to.
IMHO difficult pax exist everywhere and it is not limited by geography, race, creed or religion, trust me.
These days must really worry about the unruly ones who seem to believe they are a law onto themselves, and their numbers from information gathered from colleagues on other airlines seem to be on the increase.