discriminate against someone or something
to single out a type of person or thing for special negative treatment or denial of equal treatment; to act in a prejudicial manner against someone or something. This law discriminates against short people. You discriminate against people in wheelchairs.
discriminate between
someone and someone else or something and something else to distinguish between people or between things. I find it hard these days to discriminate between my friends and my enemies. Can you discriminate between this shade of pink and that one?