Some people have no respect for anyone and think everything is a joke. Maybe he wanted to show off in front of the others. Nadi on the other hand might have sensed in your voice and based on your sudden movement that you didn't like what's happening and she acted. They are smart this way.

Good thing nothing bad happened but it's frustrating to have your evening ruined like this. It's not easy to forget such thing and it puts you in aler, next time you see a group of people.