Death threats are inappropriate but as mentioned, it should not come as a surprise given the toxic environment we are in.
Obviously she ignores or at best miscalculate the viscous response she is going to get by being an arrogant person, like many mainland Mandarin speaking Chinese lately when they do shopping in London, Paris.
Plus, she does not represent the Chinese. She is not Chinese enough in the first place.
Her rhetoric on the Chinese superiority on parenting does nothing to make the case. On contrary, she is very successful to incite racial hatred and bigotry towards the Chinese in North America, to whom many of them don't share her POV in any event.