Yeah I think it comes down to social deixis. I took Spanish calls as well as English. Spanish has a formal and informal “you” Usted and tú, respectively. I got the same irritated reaction when clients used informal pronoun and verb forms with me.

To be clear this irritation is completely internal. I understand it would be rude to snap at people who I know are just trying to be friendly. My awareness of how inappropriate this reaction is is why I made this post.