I agree with some of the MMs said, don't make this too personal

Even though China is our mother land, but as an individual, you don't represent China. And you didn't make those "Made in China" products. I don't think your friend on purpose to hurt your feeling.

Furthermore, as a consumer, your friend has her right to choose whatever brand of products that she favors.

I would simply kept silent, if I were in your situation.