I've got a bit of a prejudice in that I expect less from people under 26 years of age and certain negative and positive factors of both men and women individually. I easily toss aside most of this prejudice once I start to communicate with a person.
Oh and people who state condescending & hypocritical things like "they're just doing it for the attention" or anything that oversimplifies a condition to a point of bigotry, like "it was Adam and Eve not Adam and Steve!".
That's not really prejudice though, that's just spending less than 5 seconds in order to solve a debate in a manner that supports your own unfounded biases against people. And it's not limited to religious people, I've seen plenty of atheists do it too.
Also people who blame others for their own problems. By this I mean stuff like "she decided to dress like that!" etc.
And teenagers (wow I have a lot of prejudices). Any teenager can leave my prejudice zone once they start being an individual and don't wear the same exact clothing that every other teenager wears and acting exactly like every other teenager out there.
After spending a year at an urban school with massive diversity* I found suburban schools to be intimidatingly full of white people that all look the same. Big jocky white boys in school mascot sweaters and thin unnaturally girly white girls with those furry boots and short short jeans. It's covered in a thick aura of insecurity.
Seriously covers about 95% of them, and the 5% that don't follow the formula precisely are ostracised excessively by the egotistical nature the kids learnt to carry from schoolmates, teachers, and families. Then people wonder why killing sprees keep occurring in these schools.
*The school is unique from virtually every other school in the city, which probably suffer similar issues to the suburban one I used to go to.