Of course I do. I expect everyone does. It's all a matter of how we've been brought up and influenced to see the world. Whenever you see something or someone that gets a response that is other than neutral and disinterested (not UNinterested) we are coming from our view of how we THINK and FEEL things should be rather than as they are. We are reacting.
When we choose to act in some way we are coming from something a lot different than when we react. When we react we're coming from a self-image, an imagining of ourselves, and how other things should be in our ego's (our conditioning's) opinion. Most people do this without being aware that it is their ego's emotions in control.
The answer to this problem is self-knowledge - REAL self-knowledge. But how many of us are into this?
So do I have any stereotypes (preferences based on beliefs) and prejudices? Of course I do. But at least I'm becoming more and more aware of them.