How could I describe friends that I only talk about fluffy topics with?
Fair-weather friends is not quite what I intend here, because it implies if times got difficult the friends would leave. I'm trying to describe people who you're not close enough with to confide in or talk about more difficult topics, but you are friends (as opposed to acquaintances). I also don't intend this to be a pejorative.
Things we have come up with so far are fluffy friends since you talk only about fluffy topics, and Disney friends, since they're uncomplicated, easy, and happy, but I'm hoping for something a little clearer that doesn't require explanation.