Context:
A while ago, the exact time ago escapes me, Soul had his right testicle removed due to infection. I poked a bit of fun at him, but didn't talk to him about it anymore.
Fast forward until about 3 months ago, and soul posts some image saying "give me a nickname only you can call me" and I just comment "right nut". He gets mad and I refuse to stop calling him Right nut.
I called him Right Nut every so often as a joke, but it wasn't much and didn't constitute harrasment or anything of the sort. He got mad every time.
There's the context.