It takes some living to realize how the world is unfair until you assert yourself. And.. asserting yourself is hard and does not come naturally to most. It does not come easily to me but comes very easily to my wife. I’m grateful for that. It balances things out. It prevents people from running over you and your ambitions just ’cause they can.
Always, the easier position for someone to take is to be “slightly” unfair to you rather than taking a stance against the majority to be fair to you and your interests.
For others to stand up for you, you need them to be able to empathise with you. Or, care for you. Why will they do that? They will do that only if they like you or if they know that you will fight back.
So.. assert yourself. Build this muscle. It helps a lot in life and in product management and in leadership.