For me, it may be that the toilet paper roll needs to have the open end away from the wall. I don’t want to reach under the roll to take a piece! That’s ludicrous!
That or my recent addiction to correcting people when they use “less” when they should use “fewer”
I know you are talking about interactions between 2 people on foot. However, when it comes to automobile and pedestrian interaction, interestingly, the government of the Canadian Province of Ontario has a website dedicated to pedestrian safety, and specifically recommends walking on the side of oncoming traffic:
So some may apply this principle to a different situation.