That said, I detect a lot of one sided thinking in his post. He took on an incredibly difficult challenge, faced huge opposition, made incredible technical accomplishments and he feels entitled to a standing ovation. When what he receives is criticism, entitlement and obstructionism he takes it personally. If he did all of this work hoping to get accolades, fame, clout, influence then he did it for the wrong reason. There is a mismatch between his expectations and the reality of the world.
In the best of worlds, we do the right thing because it is the right thing, not because we hope for a pat on the back once it is done. In dharmic religions (e.g. Buddhism), one of the principle mental states one is to aim for is detachment from the outcomes of our actions. Suffering is attachment and Martin is clearly suffering. The other thing in Buddhism is recognizing the suffering in others, and I see a distinct lack of that recognition in Martin's post here. He acknowledges his own abrasiveness but not once does he show compassion for the maintainers who have suffered everything he has suffered, perhaps even from actions Martin himself has done.
Martin has several outcomes he wants, mostly his changes (including the inclusion of Rust) being welcomed in the Linux kernel. He is attached to those outcomes and therefore takes it personally when those outcomes are not achieved. Taking a step away from this attachment is a very good step. IMO, his desire to push for these outcomes has been a significant contribution to the toxicity.