With that attitude, Chen Mo was outright flirting, and clearly the other party had no such experience. She had thin skin and got angry when she heard him, "I'm having a proper conversation with you, don't make me angry!"
"Oh, what will you do if you get angry?"
"I've trained in martial arts since childhood. Dad says you're also very skilled, so let's have a life-and-death match!"
"Wow, coming at me with life-and-death threats right off the bat, sure."
The Chen Mo of the past certainly wouldn't have such an attitude, but now things are different. He wasn't moved by her threats; he wasn't afraid of a real fight, and besides, why should he fight? She was the one asking for something, so of course Chen Mo wouldn't accept this tone.
Most importantly, Master Lin had taken action, putting Chen Mo's life in danger.