Regardless of politics and Chinese propaganda, hurling insults at someone on Github should be reason enough for action against their account. You can say that the news media is lying and all that, that's just daily grind for most English-themed media as well now, but yelling "fuck you" and "wishing a rotten vagina" upon people is not something that should ever be tolerated.
Then if GitHub was a living organism, it would lack an immune system to defend itself against infection.
If you go to github.com/$user on the bottom of the sidebar left: "Block or report user"
It really should be on each comment and issue the user has created.