Instead of deciding "who's right," let them resolve conflict themselves via a 4-step protocol.

Repeat the same refusal in the same words calmly, no matter how the other person reshapes the pressure.

Say no in three sentences: thanks, refusal, closing — with no "sorry" or justification.

Memorize one 7-word refusal sentence and rehearse it until it emerges automatically under pressure.

Say "no, I can't" — complete sentence. No explanation, no apology.

Keep drawing as joy not test — don't say "that's pretty" or "what's that?" — ask about the story.