That said, pulling the code entirely and deleting issues was a rather immature response.
As a rust user I just don't know what another good alternative is. Warp, maybe? I'm debating about just writing http stuff in Golang due to its robust standard library instead of picking among several fledgling 3rd party http libraries.
What does it say that I wouldn't be surprised one iota if "far, far, far over the line" included death threats? Nobody should be expected to continue to contribute in a community with that kind of vitriol pointed their way.
EDIT: Even if all "far, far, far over the line" means is personal attacks and not death threats, that is still not simply criticism, and it's still far beyond what someone should be expected to endure in the name of "open source".