Discriminate

[Becky]

Recognize a distinction; differentiate.

[Justin Bieber]

([unfair] [treatment] based on skin color, age, etc.) is the act of making a bad/[unhelpful] honor/difference for a being based on the group, class, or category to which they are perceived to belong. (unfair treatment based on skin color, age, etc.) can be reasonable or (related to having wrong, pre-decided ideas).

[Marquetta]

to treat a person or particular group of people differently, especially in a worse way from the way in which you treat other people, because of their skin colour, sex, sexuality , etc.:

[Lanell]

Make an unjust or prejudicial distinction in the treatment of different categories of people, especially on the grounds of ethnicity, sex, age, or disability.