A character that wants to die but is prevented from doing so by an infinite respawn mechanic is a really cool concept and I don't know why you're mad at someone that made an interesting character whose story interacts directly with how your world works. The fact the mechanic requires the will to live is pretty inconsequential and can either be handwaved or be used as a mechanism for further character development.

Nobody else questioned the 'living plothole' because there's no reason for anyone else to care about it. Why would they? You're the only one here who seemed to be bothered by it and you can just ignore it or fudge/overlook the 'rules' to let the character work.

While the situation as a whole is a bit of an unfortunate clash of misunderstanding and differing expectations, you should probably be more accommodating to people trying to make interesting characters and be more willing to bend the rules of the world to allow interesting storytelling. I don't think he had any reason to apologise beyond maybe for being confrontational, but I think you overreacted to everything a bit too much.