He is behaving in an unhealthy and dangerous way.
So the solution is to encourage his behaviour?!
Sorry but this is nuts.
Plenty of kids that age do reckless things, and parents actively have to step up at this point.
Be it dealing and taking drugs, being involved with the wrong crowd, reckless driving or other high risk behaviour. Cos actually to an extent that's what teenagers are programmed to do.
They are programmed to do stupid shit cos they haven't engaged their brains fully and don't understand consequences like they should and we expect.
And to an extent whilst parents are there to guide and be supportive, there is also this element where they have to let these kids make their own mistakes. It's a right of passage for every generation. Nothing a parent will do will stop a bunch of late teens trying to assert their own independent and natural separation processes from being little dickheads and getting into trouble.
A parents job remains to be the voice of sanity and stability. They are there to say 'when it all goes tits up, I'll still be here when your dickhead mates have all legged it and dropped you right in it'. I forgive you for your tatty behaviour and I'll pick up the pieces. But I'm not going to offer to give you a loan now so you can blow the lot on an ill advised venture.
Of course teens don't like it when you say no or voice caution when they are doing something fuckwitted. Just because they don't like it and start threatening you with alienation for not responding in the way they want doesn't mean you should then go 'oh no, I'm going to lose him, therefore I should encourage him to behave in a way that's harmful and puts his long term health and wellbeing at risk'. It doesn't matter what the fuck it is.
Parents are not there to be yes men. They are their to act in best interests even when teens are too busy with their head up their own arses to realise.
Good parenting is not being a yes man. It's making sure that an adult child knows that you won't go 'I told you so' but will recognise that you have to make your own way. You have to hope you equip them with the right tools to figure it all out in their own time and know that you'll be there when it really matters.
It boggles my mind that trans ideology encourages parents to lose their minds and pander to coercive and manipulative threats to estrange. That's not a healthy pattern of behaviour and it sets up teens to behave like that the rest of their lives. That's down right dangerous when it comes to relationships, regardless of sexuality. Domestic abuse starts with coercive and emotionally manipulative behaviour to get your own way.
In terms of comparisons with cults, you have to keep in mind you can't change someones mind. They are beyond reason. Deprogramming is about the equipping with critical thoughts. You ask questions in order to get them to ask questions to unlock their critical thoughts process again. You can't tell them they are wrong. They have to figure it out themselves and on average cult membership is about 7 years.
In terms of trans ideology I think a lot depends of the life cycle of the community bubble they are in. When that comes to its natural end (and internet and university bubbles are generally time limited) then the environment with supports that identity collapses. These communities are very much connected to life stages of those in it. I think theres a phrase about every new serious relationship you have means you shed a couple of friends. Not out of malice but because your life is moving on and you are in a different part of your life. The trouble with trans identities is they rely on the validation of the community and when that community crumbles it leaves people in a situation of isolation and potential crisis.
They suddenly realise that this validation is no longer there and they still have all the problems they had before transition. Why? Because the one person you cant run away from is yourself. You can ostracise family because they remind you of your past and the person you didn't like, but you still remember that no matter how much you try to suppress it and it always catches up with you. There's a process where you have to come to terms with yourself and give yourself some peace which I think kicks in as you get older. It's part of growing up. Validation and friends are not the same as your independent sense of self. Conflating the two leaves you vulnerable. You have to almost go 'its ok to be alone and it's ok to just be myself and be different without the need for approval from others'.
You only start to make meaningful relationships after this point. Because none of the bullshit of superficial appearances matters anymore.
Trans ideology really misses this point and tries to hold onto the fragility of superficiallity long after it's healthy or really sustainable.
It's best exemplified by the paradox of the 6'3" hairy large framed male never being able to pass if you will. It's the notion that if you demand others to ignore your sex, then you are never going to establish a healthy intimate relationship. Even if it's comes down to having an adult conversation about the 'how do we have/ not have children' question. Parents pretending this doesn't matter, do their kids a massive disservice.
We do not live in isolation. Nor do we live in a fantasy world. Just because you want something doesn't mean it should be facilitated and deemed 'unsupportive' if someone doesn't validate your choices in the way you wish. You are always going to come across people who behave in a way you don't want and anticipate. You can't control it.
And autism has this element of wanting the world to be predictable and for you to be in control. And the world just isn't like that. And this is a life lesson that every autistic person with that tendency ultimately has to learn to cope with, because Mummy and Daddy can't facilitate this not being true.
The parallel with anorexia is a good one for so many reasons (not least because there's increasing evidence that anorexia is a warning signal of autism in girls and it's not about food it's about an inner desire to control the world around you and it becomes fixated on food precisely because you can't control everything else).
Parents are not there to be your best friends. They are there to be your safety net when everything goes tits up. Parents who don't understand this, can very much be part of the problem...