It appears a change is happening in schools around the world.
Specifically, Marie Claire UK spells out what Prince George's experience will be like at school:
The students are encouraged to be friendly with all of their classmates, and not to pick a favourite friend.‘
There are signs everywhere saying ‘be kind’ – that’s the ethos of the school,’ she said on the show last week. ‘They don’t encourage you to have best friends.’
I've heard about similar policies happening here locally; especially when it comes to birthday parties.