I can see some perks to this (the language training I mean, I could give two shits about Arab "culture"). I always hate it when I'm anywhere and some foreigners are whispering something to each other and you clearly know its not something they would yell in public in English. Now we can catch hadji trying to hide behind what is essentially "code". Or make it Chinese. Same concept applies.
I agree it is much fun to listen to foreign speakers trash us and out of the blue speak to them in their language. What a shock to them.
Unnerving along the lines of walking into a room of people that speak your language and all fall quiet.------Paranoia, are they talking about ME. Is there something I should not know??
Key words and phrases in all languages should be taught to kids. ----The first words in English a foreigner learns is **** You-----
A good teacher can teach kids key words or simple phrases in 20 languages to kids, then when the kids settle in on what language they wish to learn, go from there.
We who speak English also borrow words from other languages, French, Spanish and Italian. Some English cannot be translated into foreign language and just listening to their jabber we can pick up enough English words to figure out what they are talking about.
Teach key words and words that that may be naughty but lead them into learning more.-----Yup teach a kid how to swear in 20 different languages and watch how they go from there.