Being Chinese has nothing to do with this and I find it really offensive to suggest it does.
There was a case a year or so ago with roommates, two women, one was putting all kinds of stuff in the other’s drinks and shampoo and stuff. It was discussed here on CC at the time…I think the roommate doing the poisoning was white and the victim roommate was black.
Edited to add: found the case, it wasn’t poison per se but the roommate did get sick - https://nypost.com/2017/11/01/roommate-from-hells-sick-sabotage-involved-bloody-tampons-licked-utensils/
…then there was a set of roommates where one was secretly videotaping the other (who was gay) and posting the video online…somewhere in NJ as I recall. The victim committed suicide.
https://www.nytimes.com/2016/09/10/nyregion/conviction-thrown-out-for-rutgers-student-in-tyler-clementi-case.html - that guy got off it appears.