He’s telling you he needs space to separate from you as parents. Don’t take it personally. I get that’s really tough.
Firstly, do try for connection. You love him. And inside he still loves you. But don’t be a doormat. So a bit of matching energy and natural consequences. No advice for the moment. Let him come to you when things have improved. And they will.
When he’s home, you and his dad if he’s around go and talk to your ds this weekend. ‘Son we love you and we can see you are trying to create a different relationship with us. And we can respect that. What we can’t tolerate is the way you’re treating us right now. You’re part of a family. And in order for that family to function, there are things, that need to get done. And as you’re getting towards adulthood, that means there are things that adults do in a home. So your dad and I are going to ask you to be doing more things for yourself and the family to increase your independence. Because there are things, that it it’s important for you to learn to do, such as how to do your own washing and cooking. And it would be irresponsible of us as parents if we didn’t teach you how to do this for when you end up leaving home.’
Response - rant, fuck off.
You ‘It’s unfortunate you feel like that, because your dad and I have decided that it is time for you to eg tidy the kitchen 3 times a week, clean your bedroom fortnightly, cook once a week empty and do all your own washing. And if you don’t do that, there will be consequences. We will talk about the consequences if you don’t do these things. Let me know if you want some help with your washing or cooking, because I can be there for the next 6 weeks to help you out with it.’
Then leave him to digest. It’s going to be a work in progress. You have another discussion another day ‘if you want us to keep paying for / giving lifts / etc then…’ Keep reminding him of the obligations. In a light way so he remembers and isn’t set up for failure.
Forget the theory test and UCAS. He’s got til January next year for applications, over a year for clearing. And once you’ve had the talk, don’t do a stitch of his washing again. As for studying, it’s nearly a year to A levels. My dd is taking hers right now. She is a bit of a last minute artist and she’s bringing it together. Just.
Do it like this and he will come back to you and treat you with respect. And start to ask for your advice and opinions again. But don’t offer anything, that hasn’t been asked for. And when you do give advice, keep it light and ask him what he thinks.