In China there are special traditions for expressing hatred of your enemies. We’d first heard about this kind of thing from our neighbours, who, when making dumplings on a particular holiday, chop up the dumpling filling as if they are chopping up their enemies, and pinch the dumplings closed as if they are pinching closed the mouths of their enemies.
In Hong Kong, having your enemies vicariously beaten is a specific religious service that people pay for. See video here and download a paper from Chinese University of Hong Kong’s anthropology dept introducing and explaining this practice here (pdf) (see pg. 213 – the 3rd page in – for a description). This magazine article references the paper.