Being able to discriminate suggests that we have sufficient vision to be able to make spiritually correct choices, of choosing right rather than wrong, for instance. If we find we are being discriminated against in dreams we need to recognize and honour our own uniqueness. The need to discriminate and take the best option often comes up on a day-to-day basis. We often have to compare and contrast our alternatives. This reflects in dreams perhaps more vividly than in real life and allows us to discriminate in our choices. You might also like to consult the entry for Choice/Choose.