Your question is Responding to Unprofessional Stakeholders. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
How do you handle unprofessional behavior or poor communication from an interviewer or stakeholder?
Explain how you assess the situation, respond professionally, and protect the quality of the working relationship or outcome. Use a specific example where possible, including how you communicated directly, when you involved others, and what you learned.