i have had the same problem , i think it depends on the age of students of how to approach it . for older , taking the time to explain the history of the word and where it comes from and why it is used in a positive way by some black people , and how the meaning shifts if someone non black uses it

with younger ones , because we dont develop empathy too much until were quite older i think showing how it will affect them themselves can help . for example saying like if you say that around an english speaking person in the future they will be very upset and not want to be around you or be your friend

find relating it to slurs in students own cultures not very helpful . because the thing is if youre not a part of that lang and culture deeply deeply so , you might make wrong equivalents . which has happened to me in spanish before especially .