What's nonsense is moral cultural relativism. I don't have to accept the things that other people do just because they claim it's a part of their culture.

Also, I don't think that eating dog meat is a large part of Chinese culture, nor do I think it's a thing that all Chinese people do or approve of.

If this was happening in my country and city I would be just as against it, because I do view dogs as pets and companions moreso than cows and pigs (animals which also deserve to be treated humanely).