Ask HN: Do you mind when someone comments on your screen when working in Public?

For all my remote workers out there who do work in cafes or public areas...

How do you feel when you're working on a project and someone comes up to you and comments about what's on your screen? Whether it be a compliment, note, or comment on the type of program/environment you're using?

A part of me feels like it's rude to an extent for someone to do that, however another part of me realizes I'm in a public area so can't really complain if people are trying to network/communicate.