Why do Nigerians get angry when you ask them "who is this? " on chat, phone call or text message?

If you have not had any form of communication with someone for long, how do you expect the person to still have your details and remember you all the time?

Girls do this often, they have not chatted you for months, you probably have forgotten about her; when they call or text and you ask who is this pls?... they will become angry and ask you
"so you mean you don't have my number in your phone again"?
After that some will end the call or stop the chat.

How am I supposed to remember everyone I've met all my life when they are in thousands?

Isn't it common sense that you should introduce yourself or remind me who you are when I ask "who is this?"
Is there a better way to ask who is this?, without getting the person asked angry?
Is it the frustration level in the country that is responsible for how people react to this simple question?

some people see it as rude.
who is this please is better or better still who I'm l chatting with pls

DIAMANTE1759:
some people see it as rude.
who is this please is better or better still who I'm l chatting with pls

RIP English.