In the US the problem isn't race for the most part. Its class. If you see someone, whether they are white or black, and they dress professionally, are clean, etc. then you'll get vastly less people looking down on them. However, if you see someone dressing like a stereotypical "thug" then of course you're going to associate negative thoughts with them because the way the dress brings about negative connotations. Of course, the issue is that a lot of Africans in the US are disproportionately in the lower classes and in order to tackle the symptom of racism we need to address the bigger concern of income inequality and social mobility.