Honest question: have you personally seen the "propaganda" of the other side? If you've only seen one side, how are you so completely sure you know which one is right?
The wumao '50 sent army' is active on twitter, in both Chinese and English.
I don't accuse said posters of being members of a 50 peso army. I assume that their (nationalistic) opinions are just that.
You should extend these same assumptions to China.