Whats one of the stupidest reasons you were told you can’t ship something (inspo from someone else on this subreddit)

I am a chronic danganronpa fan, and someone once asked what my otp was. I told them, and they said I couldn't ship them because they were Friendly Rivals. The characters were canonically over 18, around the same age and knew each other well. I asked them why it mattered. They blocked me after that.