Isn't it rare? They were saying that the Chinese were worshipping foreigners and not paying attention to their own traditions. Ye Jian first talked about accepting other people's culture before mentioning that they were broad-minded and pointing out that the Chinese were hospitable and would not reject a festival that brought happiness to them.
After that, she made use of the fact that the girl used English and not her own language to ask her that question as a conclusion. If you could even abandon your own language, what right do you have to criticize our country's acceptance of other cultures?
After leaving the school, Miss Betty personally apologized to Ye Jian and that was it. After all, the world is not the same everywhere. Moreover, they were not from her country and she couldn't possibly control what they were thinking. It was fine as long as she could protect her country's dignity.