How would you feel if a coworker you were great friends with got offended by something you said but didn't say anything to you but made a complaint?

Anonymous
So a coworker who I was great friends with got offended by something I said as a joke but didn't say anything to me and instead made a complaint and blocked me on social media and the boss didn't tell me what i had done only that it was offensive so I had to play detective and figure it out what I had said
How would you feel if a coworker you were great friends with got offended by something you said but didn't say anything to you but made a complaint?
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