Hmmm interesting points...I'm American and every reach someone ask me am I Jamaican I've even been ask to bring ice to a room etc...I laugh it off as it's a compliment in IMO...
So when I'm with my "friend" 10yrs younger they ask where WE from when, I say I'm from US he's from here they give us a look as if "Oh your one of them" as the conversation gets shorter lol so I guess judgment comes in all forms...because I find they are ok talking to us when they think we are a couple from the same place but when they find out we are not.....Assumption comes to play.

It's all good at the end as I can care less what one thinks and just for the record I get approached here at home by younger men so it's not surprising to me.