Get up early tomorrow, and go out for the day. Disappear. If you have children, they get left with him. If he's expecting you to make dinner/do the shopping/clean the house, well, it won't get done.
If you can, go one better, pack a bag, and go away for the night. With just a text mid-morning 'Off for a break. Back Friday.' Nothing else.
When he then phones in a towering fury, point out to him that as in his opinion you make no contribution and can expect no say in the running of the home - what difference does it make if you're there or not? Surely none to him - boss of the house, earner of money, king of the castle? Surely you are a nothing to him?
Oh hang on it does make a difference? What - he needs you for childcare/domestic tasks/being a partner?
Well then he can FUCKING WELL START RESPECTING YOU AS AN ADULT OR THE ENTIRE ARRANGEMENT IS OFF!!!
You say this, very firmly, down the phone, and then say that you will be expecting a text informing you of when the parental controls have been removed. You will then come home for a mature, adult-to adult conversation about internet usage. You will fully expect YOUR opinion here to carry as much weight as his. Firstly, you will no longer agree to your neighbours using the connection for the security reasons which have been outlined here. (Then after a month of seeing them kicked off reassess the usage - I bet his eyes will pop out of his head).
But anyway- the internet's a minor thing really. Be warned. If you don't slap him down here in the STRONGEST TERMS POSSIBLE - by being prepared to simply WALK if he tries to treat you like this - then I'm afraid he will treat you like this for good. It's NO use threatening/pleading/having rows. No use at all - simply because if he's treating you like this, it means that he does not see you as a person he needs to respect. At all. Changing that is vital, and the only way to do it is to make him see that you WON'T take it.