I don't know about the situation in Guangxi ethnic Zhuang autonomous region, cause China is a continental size country and different ethnic groups all have their unique cultures and diets, but in Beijing if you say you eat dog meat, you will be literally shunned by everyone, almost like being ostracized and become an outcast socially.
It was made by a Korean social media channel based on US, maybe because these Koreans also believe they are being targetted on this issue.
In China, ethnic Koreans are well known dog meat eaters.