What is a prejudice?
A prejudice is a preconceived opinion which is not based on reason or experience. All prejudices are based on errors of fact and/or logic. If a property of some class is valid and the consequent is sound and it doesn't make or imply a value judgement based on these properties, then it isn't a prejudice.
This is NOT ranked or ordered, but here are some of the predominate types of prejudice I was able to identify. Please feel free to point out more in comments!
- Gender-identity, sexuality, intersex (including LGBTQ*)
- Religious discrimination (including against those who choose not to have a religion (especially in the military) and minority religions)
- Ableism (discrimination against the disabled)
- Mental Illness / Neurotypicalism (multifaceted)
- Intelligence (people across the spectrum suffer discrimination & bullying)
- Appearance (height, weight, looks, dress)
- Linguistic discrimination
- Classism/socioeconomic discrimination
- Rape, Abuse, & Violence stigma
- Political discrimination
- Discrimination against former felons
- Prohibitionist prejudices (assuming that all people who wish to explore altered states of consciousness are 'drug fiends', etc)