Typically ignorant response on this subject. I speak from experience, but only from my own experience. Not from any others.
It’s been far from normal. It’s been extremely unusual and difficult to handle for everyone involved.
It took them many, many years to come to the reality of how they feel. The difference today is that they can now express those feelings whereas in the past they would have spent a lifetime feeling confused. Both now feel comfortable in themselves, accepted within their peer groups but very aware of the prejudice that exists in some sections of society. One is now studying for their PhD at Southampton the other for a BA at Exeter.
I can assure that their parents are very far from being idiots either.
Whether some children with mental health issues try to copycat those with genuine issues is beyond the scope of my knowledge. What I do know is that the amount of screening, counselling and careful slow transition means that such children would be screened out and directed to more appropriate support very early on.