> As a white guy, I'd certainly encourage you not to worry about this -- if we're talking about an upper middle class, professional-ish activity, you can be fairly sure that all those white people feel self-conscious about their group being so white and would welcome you to join them.

Although I appreciate the intentions of such people, as a non-white guy this always made me feel uncomfortable. That I'm not being welcomed for being a new member but rather a new member who's somewhat different (in color in this case). Whether this is at work, sports groups etc. I guess you call that a token?