Why can't you wear black shoes with white socks?

The colors of socks and shoes must be the same. Unless you can wear white sports socks with black sneakers, formal black shoes must wear dark socks. In foreign countries, people like formal socks with plaid socks, and we can also buy them here. I don't care much about the color of socks at home, and even think that white socks with black shoes are very particular, but they will be laughed at abroad.