I can only echo what grahamS said.
At my kid’s school, all the mum’s love showing off about how attentive they are about the other kids..
‘Oh little Jimmy was adorable in the school play’
‘How is Jemima’s* sore ankle? poor love’
‘I heard all about Timmy’s amazing science project. He’s so clever…. you must be really proud’
‘Oh, Max was upset this morning, they’re all so tired at this time of year.. He looked like he was back to his old self when I popped in at break time though’
It’s a type of maternal virtue signalling contest that I just can’t get involved with. Nice as it is. The phone call may well have been unrelated, perhaps about thrush, or to gossip about summink, but the virtue signalling is an important part of the social exchange.
You are paranoid playground dad.. And your relationship with your wife sounds wierd
*obvs I wouldn’t admit to sending my kid’s to the type of school that attracts Jemimas