Seriously?
How about
'
Sue J,
can you pick me up something from IKEA this afternoon?'
'sure - what do you want?'
'
I think they sell those giant orange cushions that we saw in Gina's place' (Gina is not in the WhatsApp group btw - it turns out that nobody else in the group knows her)
'Oh yes - I'd love those in mint. They'd look great in the summer room...'
And so on.
15 pings later they agree that the OP will 'pop round with the money, IN A MINUTE!?!'
An upshot of this is that those working in quiet environments have to mute the chat, occasionally missing out on genuine time-sensitive messages as a result.
Still think I'm being presumptuous?
EDIT: I probably missed
@Magicpole 's irony :-l (it's been a fractious morning...)