I agree with you. I just wanted to point out something you wrote yourself in your second note: "In some situations, you won't have a chance to correct mis-unde

I agree with you. I just wanted to point out something you wrote yourself in your second note: "In some situations, you won't have a chance to correct mis-understandings." I think this is more important than to be in footnote. Its worth to listen patiently where you can expect to be listened to patiently. [1] Otherwise you should take initiative and perhaps politely interrupt and say something to distract from the misunderstanding. Arguing with customers is almost always a disaster. [1]: Although you might want to know what the customer thinks even if you are sure you aren't making a sale. (edit: slight clarification note)