Most members of minority groups have experienced the uncomfortable and humiliating feeling of discrimination. It might happen on a public street, in someone's home or even at work. While it's illegal for an employer to discriminate based on race, gender, age, religion, nationality and other factors, that doesn't always stop it from happening.
Often, the slight of discrimination is felt before you've identified the action. Mistreatment stings, even if you can't say why. It can be hard to pinpoint hard evidence and to know when to file a complaint.