Ok I get when it's a old acquaintance and you bump into them unexpectedly it's normal to say 'we must catch up sometime' when they have no desire to so. That's weird in itself.
But a school run mum befriended me via WhatsApp over my dd being reluctant to go into school. Offering me support. Said we should meet up etc. When she said let's go for a drink I replied that would be lovely, she never replied to any other message. All on the same night. I said on further occasions j was free if she still wanted to chat. When I see her at school we say hello but it's like we never talked on WhatsApp.
Its bizarre. Why? I dont understand people.