Re: Off to the races...
Guilty as charged, I suppose. Still...
I worked with several women who were of Greek ancestry. Most of the time, you'd never know it...I wouldn't have known it, save for their last names and the fact that, at the time, there was a Greek festival in one of the nearby cities and they couldn't stop going on about how excited they were for it. I have known, at different points in my life, five or six Armenians. Again, aside from the occasional explicit statement about their ancestry, they were just like everyone else I knew. I've worked with a few people of African descent...which was a little more obvious, visually, and because of that, they tended to make jokes about their own ancestry and upbringing out of habit...but overall, they were just like anyone else I worked with or grew up around. The Vietnamese kid that played trombone in my high school marching band? Aside from a slightly more difficult name to pronounce and a few visual differences, he was just another kid in an American high school.
It's an issue if you choose to make it an issue. Some people insist on making it an issue. Some people are just busy being who they're going to be and don't want to spare the time and energy talking about it to make it an issue.
So, the most honest answer I can give to your question is, yes and no. Some people will find it incredibly offensive, some people won't give it a second thought (unless you make it a jingoist caricature of an interpretation, and then I hope they take exception to it). I work with people of several different ethnic and racial backgrounds and it makes no difference to me, or to pretty much anyone I work with...but I know that those same people can go somewhere across town and likely get a much less open acceptance.
Roleplaying games aren't like Hollywood, where people are upset because the lead is ALWAYS a white male and parts that should be cast with specific ethnicities are cast with the the same white-bread actors. Diversifying your cast of characters is kind of what that whole movement is about...getting people to start to see that the hero doesn't always have to be some square-jawed straight white male, and that the woman doesn't always have to be the love interest/damsel in distress, and being a different ethnic background doesn't automatically relegate you to sidekick status, at best. Telling someone that they should only roleplay their own ethnicity or gender is akin, to me, to telling screenwriters that they can only use characters of their own ethnicity or gender...and that would get really boring, really fast.