Take it as a life lesson ... if anyone says or does anything abusive or manipulative, stand up for yourself ... always.
And a step beyond that is ... if you see anyone being treated that way, also stand up and say something. Sometimes all it takes is for one person to say something to stop any abuse.
The more you do things like this in a kind respectful and thoughtful way of protecting yourself and others, the more you will be recognized as a strong individual that everyone can rely on or respect. It builds a shield around you that will allow fewer people or systems to want to abuse you.
Sometimes, just the act or saying you don't like a behaviour or you don't accept that is more than enough to stop someone from starting any abusive behaviour.