In the US, there are positive and negative stereotypes, too. German efficiency and Japanese perfectionism and perseverance are among them. Jewish intelligence and commitment to education, too. These things have a basis in reality, of course, but they shouldn't be mistaken for reality itself. It seems to me these things appearing in your textbooks were probably attempts by your own government to get its people to emulate what it sees as positive traits in other cultures, rather than an attempt by foreign adversaries to paint Chinese people as inferior. Of course, when the message was a little too unclear or negative as in the "toxic textbooks" incident, your government deflected blame.