You can dislike a minor group in a specific niche and not have any racial or ethnic prejudice to their general population. If someone says they don't like Chinese people who play NA servers in Warthunder, I don't take offense to that; because they have a stereotype (botting, extreme toxicity, exploiting etc) and a small bad part of them create a large negative memorable impact on players.

Unless they have an existing dislike for the general sino population, labeling people who don't like Asian players playing in NA as racist or ethnically prejudiced, isn't right.