it wasn't good, you just threw some shit in a bowl and went "ooh argument"
Is it acceptable for a white person to tell another white person they’re “acting like an [n-word]?” Yes or no.
again, i'm not saying that people are acting like retards, i'm calling them one. There's a contextual difference that you don't seem to understand.
Now if we're going to fix that argument for you, free of charge you would say something like "is it ok for a white person to call another white person the N word?" could go either way depending on the context. Heavily context dependent usage.