Comment by TacticalCoder

> AFAIK wearing outdoor shoes indoors is mostly an American thing,

It's ultra common in many european countries. I've got one friend where the rule at his house his "shoes off" but most others keep their shoes inside.

It's also highly common for people living in houses to have a "shoes on inside, but only on the ground floor" and shoes off upstairs.

So I guess YMMV.