Parents don't need to brainwash, it is who they are. Usually parents have to learn about transgender because of their child.
Actually society produces the type of confusion that lead children to become trans-whatever. Parents can also unintentionally produce those thoughts.
All the trans-whatever I have met all had serious mental weaknesses that they were contending with. I have known a dozen, and none of them were truly right in the head, with many of them coming from backgrounds of rape and sexual abuse. Also, statistics have consistently shown that transvestites and transgenders have the highest rate of suicide of just about any group.
Would you be "right in the head" if your brain was trapped in the body of an ape or lion or the wrong sex body?
Their brain developed in the womb one gender and their body another. This is not learned behavior. Development and awareness happens and different ages. Some doctors and parents recognize the child is not traditional and seek answers, other parents don't want to know or do anything, or let their children be who they are inside.
Yes, it is confusing and messes with the head, because it is not automatically accepted a normal to just be themselves. They are judged, test poked and prodded to analyse them before they are told why they are different and what to do about. They are often bullied and abused because they are different.
I imagine it must be a lot like PTSD going through everything before they are just allowed to be themselves.
I did not question or judge the friends my kids brought home, just what was necessary to protect them and get them help through child services. I treated them as just kids. Our home became a safehouse for several kids of various types when they had trouble at home or school. They only went into as much detail as they wanted. They were safe, had food, a place to sleep, help with homework and visits with social services if necessary till other arrangements could be made or they were able to return home. Their parents and school knew they were safe, not out on the streets, so did the police. Some were suicidal, some abused by parents, some had been involved with drugs, some were gay or transgender. To me they were just kids searching for answers and I tried to get them in contact with others that could help them. A few hours, a few days, a few weeks........ if they respected the rules of the house, they were welcome and safe.
My personal beef was larger or unusual piercings. Kids knew they should cover or remove when possible while in the house. A few would get their big looped ears tugged by me. Nose and lip rings were easy targets. They were polite enough to put them back in outside. I had tape to cover those that were not easily removed and to my opinion unsightly. It was more of teasing them but it was respect for me and my rules as well. I did not like them to wearing hats indoors either. No cursing, abuse, drugs or smoking. A few would forget but they were willing to comply. I kept a curse/rule jar by the TV. It was not about changing them, just teaching them respect and to conform to moderate rules if they wanted to be accepted. They could have stayed outside or gone to someone else's home or found other friends. It was cooperation.
They were for the most part good kids, just needed to know someone cared about them.
You can disapprove and disagree without condemning or punishing or outlawing something. In a public or business setting, it is your discomfort. In your home, you can say no or tell someone to leave.
If you are a parent and can't accept your child and want the best for them, give them up. Don't hate them, curse them, abuse them or force them to be something they are not inside. If they need help and you cannot give it to them, let them go and find the right help from others. If you don't understand, learn.