[shakna]

I'm confused. If you ask me a question, answering 'No' seems to be an option... How is it rude to reply that way?

I'm well aware cashiers are people, and want to treat them that way.

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> Would you like to upgrade to a large?

> Nope.

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> Can we just get your phone number?

> No...

[OkGoDoIt]

I think the parent took the literal answer of “no” to be a bit terse, depends on how you read that example conversation. I doubt anyone is arguing it’s actually rude to refuse to provide a phone number, just to not be snarky when doing so.