Stereotypes can be taken down almost as easily as they can be put up. Here are some things to try:
-Spend more time around people who are different than you; knowing someone better can erase the predispositions you have about them.
-Set a good example, and don't treat people as if they were below you.
-Speak up against stereotyping and the prejudices that people hold.

How to Prevent Stereotyping