I don't know, but this little tangent seems to reveal that in Loren's world, immigrant = black.
We know what we are exposed to. It might be that where Loren lives, the majority of immigrants are black, perhaps of African origin. My immediate supposition of "immigrant" would be asian or indian decent, as that is what is most prevalent in my part of the world. To someone in the southwest part of the US, it would more likely be envisioned as hispanic. I don't think it's necessarily telling of any particular racism (which seems to be what you are implying), so much as telling of exposure and locality.
Of course, I could be wrong, but I don't think that there is enough information contained in Loren's statement to reach any reasonable conclusion in regard to his views and beliefs.