Almost only Chinese people speak Chinese. However, many people speak English (I come from Spain, for example), so in this case you can hardly pin it on a single culture.
I think in this case it has to do more with 4chan's culture than a regional culture.
That wouldn't be an issue for just offending people, but only if it became political. Don't forget the US also has government control and censorship - try posting child porn on Twitter and see if the government leaves you alone.
I think in this case it has to do more with 4chan's culture than a regional culture.