Background
I have a coworker with whom I communicate online (slack). When this coworker has something to tell me, they always start by saying:
Hello, how are you?
Then they wait for me to answer ("Fine and you?") before actually asking/telling me what they wanted to ask/tell me.
Problem
I find that, having to respond and sometime chitchat a little before actually knowing what they want from me, is annoying me.
I would like to tell them "could you just go to the point when messaging me, please?" but I'm afraid of being perceived as rude.
Question
So, how can I ask my coworker to go straight to the point without being perceived as rude?
Like, having them directly saying something like:
Hello, hope you are well, here is my problem I need your help with.
Notes and clarifications:
Talking face to face is a possibility
Not sure it's important but I'm on the autism spectrum
Well explained and backed-up frame-challenge are welcome.