I find it very irritating and even threatening when a stranger leaps into using and reusing my first name, in a way that seems calculated. Especially people making cold-call phone calls!

My impression is that people trying sell you stuff deliberately try to use first names prematurely as a way of getting some kind of extra control. I imaginek they learn it from books on how to deal with the public, written I suspect by Americans, who seem to be particularly prone to leap into using first names anyway.

I think there are definite differences here between the British Isles (including Ireland) and the USA. White America anyway - from what Azizi writes it sounds as if Black Americans are a bit more like we are over here about things like this.