Slang has become retarded and dysgenic as the people become dumber andore ghetto. It's bad enough people were to lazy to say "Brother", but now people are so Pot 'n Porn addled l, they can't even be bothered with that. "Bruh" is the ultimate linguistic "give up" for people too stupid for life, but who are too protected to kill.
What stung it was it's perception. It thought some armchair psychiatrist was giving an actual diagnosis. It is/was too mentally retarded to realize OBCD sounds like, well you know. If it would have actually gotten the insult it would have been way more butthurt.