Yes, there's gender narcissists and full blown gender fascism in the US now, I 100% agree with you that most cis people are gender narcissists, whether implicit or explicit.
Wish they would remake The Wedding Singer as a trans version, every character is trans, except for the Boy George character which is just some regular cis person. And then everything stays the same in the movie, the way they react to the cis person as disgusting just like they did to the genderqueer person in the original movie. Lol. A girl can dream.
Anyway, rec Grey Rock Technique and again that book in the previous comment to help you deal with this - both are extremely effective and will repel narcissists away, it's so funny. Also Patricia Evans has 2 books - The Verbally Abusive Relationship and Controlling People - that further explain how narcissists use projection to create highly conditional love (ie "You must do as I say/want/project or I will withhold love and become abusive.").
Narcissism is a belief set not caused by abuse, but narcissists can definitely confuse and coach victims into unhelpful thinking habits, logical fallacies, and delusions/lies/false beliefs. Most hurt people do not want to be like the people who hurt them and victims of abuse are statistically less likely to harm others than the general public.
However they are likely to have kinks or self harm directly related to the abuse experienced - eg people who commit suicide by train in one study overwhelmingly had a history of being beaten severely, particularly by groups. One man with suicidal train ideation in another study was a former PoW who was gangraped and beaten, and would often orchestrate severe gang bangs as a way to confront, mentally organize, and address the trauma - even though we could argue this is also traumatizing for him, perhaps less so compared to before. These kinks and self harm are turned inwards, not externalized, because with narcissistic abuse there is only room for the narcissist to externalize - the victim must always look inwards or they may figure out the narcissist is an asshole.
Ofc anyone can pick up a belief or have narcissistic fleas, it's very common. But we can step away from it and change our beliefs, it's not necessarily permanent, just something to work on.