It's so crazy that you mentioned that because a while back I was helping someone with their website design and I provided some stock images of golfers and the first round of images he liked so we used them on the site, which was under construction. He emailed the link to a few colleagues to get their feedback and they also had the same concern about whether the product he was selling was for ethnic clients...so we ended up having to throw on a few Caucasian models to balance everything out! I thought that train of thinking was so strange but I guess since you've experienced the same thing, it seems more people must have this way of thinking when it comes to models of color.
I can't say I understand it but then again, the modeling industry is good for turning certain things upside down!