The standard "What would you do if you had a rude customer?" type of questions, or "How would you keep in contact with the team?"

I wouldn't take their inquiry as rude rather than not understanding something. In a clear concise matter, I would attempt to look past the rudeness and rather educate them as to their inquiry. Frustration can be misconstrued with rudeness. If it continues, explain that you are sincerely trying to help them and in no way condescending but what can I do to help you see this issue/question/ concern in a different light. My goal here is to help you- not frustrate you.