The person who told me I used it offensively didnt really explain why to me. I've avoided saying the word for years straight now. I still don't know how to say the word ethnic appropriately.
I can't help but think I might have said it with a colonial perspective
Btw, why is it perfectly fine here?
'There's fucking ethnics everywhere' probably wasn't a good choice.
"Your Honor, you're a filthy ethnic!"