[brujoand]

There is seldom need for praise, that's what makes the praise mean something. Some stranger took the time to thank a person for doing something. Huge high five, probably felt good for both of them. I don't think we should discourage positive human interaction.

[thih9]

It still feels to me like praising somebody for doing something mundane, e.g. washing their hands.

Sure, a positive interaction and rewarding something important. At the same time we shouldn’t forget to aim to make this behavior commonplace.

[MarcellusDrum]

Someone holding the door open for me if I'm right behind them is a mundane thing and should be the default, but I still thank them for it.