if you hate China, then keep it to yourself. You have no right to downvote anybody for sharing his learning of Chinese language.
Wrong!
Its his stake he can use it for upvote or downvotes, reason doesn't really matter.
Its just polite to leave a reason :)
Also, we cant stop it.
Do I agree with this bahavior? No, not at all.
But its allowed.
P.s. I even think I know who you talk about.