I have a coworker that if you try to call her and she doesn't want to talk she straight up changes her status to away or busy and then just ignores your call. She is an a-hole but not for this reason, lol.

I was trying to explain to an elderly friend that people don’t just phone other people now and certainly not at times they will be doing something.

She found it hard to accept that many people find it rude to be called unannounced.

As an example, at one time if someone was organising a social event (eg party) they would phone around to invite people.

But that’s incredibly rude you are imposing on someone and also asking them to decide or excuse themselves on the spot.