What's there to say? As long as they are not saints or gods, mortals are always partial. Just like the same biological child, parents always favor one. The boss must treat his employees with likes and dislikes. This is normal. If you meet a boss who treats everyone equally, you can only say that the boss doesn't like all his subordinates.

In this case, you must first accept the phenomenon of "preference". Then think about it. Why do you care about this? What is your inner expectation? What can you do to realize your inner expectations? This analysis will turn some prejudices into motivation.