Angel and Demon by Scorpio
It was posted on Nifty and listed as Best of Nifty, It's about cultural clash as in lifestyle differences, rather than ethnic/nation cultural differences. It's pretty good, I'd say.
There's a list of stories popping up in my head.
However, among the ones I have read - I'm a real slow reader - Working it Out by Don Hanratty is always the go-to story if I just want to read something.