Who was worse here?

My bro had a massive argument with his friends. One of them said our mom is gonna die soon because my bro hates dogs. So my brother told him his mom will die soon and his aunt is already dead in a sarcastic manner (she just died of cancer). That friend went mad and they started calling each other names.

My bro still hates him. It's been 6 months now.

Who was worse here?
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