In conflict of this sort, it is always the fault of both.

If I were part of Jolla, I would have had much difficulties to deal with this. Their reaction was maybe not the greatest and maybe a bit late but they did consider your request. But as they decided to help, you refused the discussion and thought that one message would be enough to feed the discussion (see logs of one of last community meeting).
I think that was a deeply wrong decision and that killed any solution.

THP ignores you. That is maybe harsh, maybe well-deserved? But why do you think Jolla can decide who is right. Plus even for professionalism, should they force THP to talk to someone? That is very difficult. They probably have questioned him if some solution can be achieved. But if he doesn't want, what can they do? Fire him because he doesn't want to talk with one guy while he is much helpful for the vast majority?

At the end, it looks like it could only be either THP quit Jolla or you quit Jolla!

In general in those circumstances, especially as you want this to be a personal affairs, when you do not like someone, you get some distance and you forget about that person. When I am unhappy about one company, I stop buying stuff from them and ignore what they do.
But you prefer to remain in the loop and do as much destruction of Jolla as possible... That is bad, and especially for you because you keep thinking about that.

I believe you should get some distance and think about it after some months... Enjoy your life, your friends. And there is more than one cause to defend (= Other companies, ideas need supporters)