The meme is pointing out hypocrisy among those in America. Its common to hear them mock China for having a social credit score system, while apparently not realizing they have exactly that with credit monitoring companies. This is all made more ridiculous by the fact that there is no social credit score in China as Americans understand it. The joke is that Americans brag and call everyone else barbarians, when they themselves are the barbarians. Its pure projection to inflate the massive American ego.