Imagine there's this guy at your work, who every day brings up some crime or another, but somehow the perpetrator is always black. So you tell him "Can you talk about something else?", to which they get defensive and say "Why don't you want to talk about this? Can't we all agree that this is bad?". If you let this situation go on for too long, you'll soon find your workplace taken over by open racism, and everybody who's uncomfortable with this is going to quit, reinforcing this trend.

This is what's happening on almost all western social media, and society in general, regarding China. Open sinophobia, hate speech, and calls for violence.