You'd need to be some kind of military vet boomer with PTSD to have any racist beef with Asians in particular, even infamous Austrian painter himself was like "honorary Aryans" etc.
I think this friend David is just gaslighting Jun with his own neurosis.
In good faith, I will assume that the evil conspirators are also having adversarial relationship among themselves (they want to take MC's powers but fear getting back-stabbed at the last moment) and therefore can't plan freely resulting in this Goldberg Machine of a plot.
This is a great case of "moe gone wrong" IMO. When a high school girl acts like this it's cute and endearing, but when a supposedly-single mother in her thirties is still all like tehehepero~, it's just rather concerning instead.
Would be 10/10 deconstruction of the moe genre if author did it...
Even if you think it's all a game, it takes a special kind of boy to just go full murderhobo on random NPCs on your first playthrough, potentially locking yourself out of content and OP quest rewards.