It’s been addressed somewhat (hard to find amid the hundreds of posts, though).
The concept is that for an adult who has reached the age of majority, there has been sufficient education, whether formal or not, to understand the social contract.
By not renouncing it upon reaching the age of majority (or at least soon after) and by continuing to benefit from the benefits of our social contract, one implicitly accepts it, thus accepting to be bound by it.
As also stated, one can at least attempt to find an isolated portion of the world and live as much on one’s one as possible, neither contributing to nor taking from the rest of human society, thus choosing not to be bound by our social contract. This is especially true of marcmcroy who is (apparently) of sufficiently sound mind to make such a choice.
But that’s not what he actually wants. He wants to accept the benefits of human society while only contributing what he will, thus violating our social contract. And, based on his posts, he understands that social contract and wishes to benefit personally from it while violating it at will (otherwise, no attempt at rules-lawyering to get out of fulfilling his end of the bargain). He doesn’t want to live on his own, unbound by human society. He wants to live in his own comfortable house, surrounded by people who accept our social contract, protected by police, driving on decent roads, buying food produced, packaged, and sold by publicly educated people, protected by our military from foreign incursion, provided electricity and other utilities built up on public infrastructure projects but take or dismiss the rules that go along with all that.
Perhaps that’s not as comforting as a signature on a piece of paper, but there you go. I might excuse it of a young kid who might not know better. But marcmcroy wishes to present himself as somebody considerably erudite, for whom no such excuse exists.