There are postive and negative stereotypes, but some stereotypes originate from the truth. I hope no one hates me for this, but in Chicago I have noticed that we have a lot of Chevy Astro minivans on the streets. If the Chevy Astro is not a commercial vehicle, I automatically assume that the driver is a Mexican!
I often catch myself making this assumption and scold myself. Of course, when I pull up alongside the minivan, I then observe that the driver is in fact Mexican! I have yet to see a Chevy Astro minivan in Chicago driven by someone other than a Mexican. Maybe this goes beyond stereotypes.