"A Minority, a culturally, ethnically, or racially distinct group that coexists with but is subordinate to a more dominant group. As the term is used in the social sciences, this subordinancy is the chief defining characteristic of a minority group."

Source: http://www.britannica.com/EBchecked/topic/384500/minority

So, facing discrimination, which I would think is part of being subordinate, does make you a minority.