Actually, you CAN be indoctrinated, especially if you are a young child.
When people tell a child something, untrue or not, at such a young age, that child, being the naive little fella he/she is, will believe it, that's why when you lie to a child, they don't ever tell you you're lying, they lack logic, so they can't put together a reason to debunk your claim, that's why child predators are able to do what they, when they lure children into that white van, that child won't be thinking, "hey, I shouldn't go into that white van" Instead, they'll be thinking, "that guy in the white van offered candy, I want the candy".
The same thing with Disney, though I doubt that they're driving force is molesting children, they are still doing something almost just as a bad. When someone portrays a characteristic to a child in a positive light, that child will want to enact that characteristic, that's why if you show a child a pride parade, and tell him that's how LGBTQ+ live, that child will want to become LGBTQ+, because young children are emotionally driven, and when they see someone appearing to be living happily, that child will want to do the same, believing the same thing will happen to them.
"That is some tinfoil hat level bullshit"
Says the guy who believes there are 87+ f**king genders.