It can happen sometimes at work when you've told someone you can't do something because it's against company policy, or it just can't be done for whatever reason. It can also happen in your personal life when you've said no to something, sometimes with a reason, and sometimes just because no is a complete sentence.
The other person will then launch into a pseudo-academic/pseudo-intellectual discussion about why they think they should be able to do that thing. It's not straightforward customer service stuff where the customer is often right (e.g. your courier lost my parcel, therefore you should send me a new one free of charge), but more academic or philosophical stuff, almost as if they've joined a debating club or something.
Does anyone know what I mean? Is there a word or phrase to describe it?