On the other hand some notable open source leaders seem to be abrasive assholes. Linus, Theo, DHH, just three examples who come to mind. I think if you have a clear vision of what you want your project to be then being agressively dismissive of ideas that don't further that vision is necessary just to keep the noise to a low roar.
In this case, the unnecessary insults detract from the otherwise important message, and reflect poorly on Zig. They were right to edit it.