I dont think racism and death need to be synonymous. However, what you could say in the rulesis that a degree of racism may be used in storylines, just as death, but not as trashtalk or trash constructs.

Racial and racist are different words. Theres nothing wrong with having ethnic characters, but there is something wrong and highly unoriginal/unnecessary about those characters enduring the same racist trash every week instead of intelligent writing aimed at the character.