Just because he wasn't offended or angry (he was upset), it doesn't mean I can't have my own reaction nor am I telling him or you, for that matte, what your reactions should or shouldn't be. Too often, I have seen people outed, including by accident, and in a few cases of accidental outings, it had some very bad repercussions. As someone who was outed against my will on a few occasions, I taking outing very seriously and get angry when it is done without permission, accidentally of otherwise. Had it been malicious, I would be even more angry.