Hi there. No, he wasn't being rude. "Debrief", in this context, just means that he's going to review things with you, update you, or go over the results. It's a professional way of saying it. Debrief is also used in a military context, but not unheard of in a professional setting.
It could be interpreted as him being direct, but definitely not rude or impolite.
Hope this helps. :)