If you think skin color has something to do with it, how do you explain that very dark people from India are well accepted here?  Or that Asians are also well accepted, if not downright admired.  The fact is that skin color has nothing to do with it.  Some people just don't appreciate aliens disregarding our laws, coming in with little or nothing to offer, refusing to assimilate, and then telling us (as does la Raza) that they will reconquer the southwest.