They don't have actual internet access... Grate firewall and stuff... And its written so they can't hear it unless they use a screen reader lol.
Anyway, you are literally cherry picking right now. Most Chinese people wouldn't give a single shit just like how most US citizens don't give a single shit about people saying Fuck USA/Fuck America or Germany being called Naziland by literal politicians (Erdogan, Putin, Orban, Polands Piss party as a whole to name some...) most people have better things to do than to get upset by someone saying something like that on the internet...
How? Just because i write something? Are you a little upset yourself?