If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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Yes. Getting children to openly state: "We can't be best friend because you are best friends with X" seems to ask for trouble but if you have enough presence in the room to keep the discourse inspirational and playful it might be fine.
Ah yes. "We can't be best friend because you are best friends with X" wasn't literally said with respect to someone in the room. Something like that was quoted by a girl as an example thus it wasn't personal in that moment but I assume that it is a real statement too.