It means you're not being neutral and judging correctly, and you are choosing one thing over the other for the wrong reasons

It means "You are unfair."

Hello, It means you are judging partially. you are unfair. Regards.

The context of the phrase means that you are partial in judgment and show favoritism towards one person or group over another. It can also be used as a tongue-in-cheek when good fortune falls on someone else and you have bad luck. Example of part one: The referee, having been bribed by the blue team, was not fair towards the red team. Example of part two: Bryan: The boss just let me leave for the day, now that I have all my work done! Adrian: That's not fair! Bryan: No worries, Adrian, you'll get there eventually!