I'm nice to everyone unless they look dodgy. Person lost, I'll either point them where they want to go or sometimes take them at least part way if I'm either feeling nice or going that way anyway.

On the other hand there was a guy who asked if he could borrow my phone to make a call and I was like nope. But then again it depends as I unlocked and handed my phone to a young girl whose little sister had been hit by a car so she could call her parents.

Think everyone could generally be nicer (or at the very least basically polite) to everyone else as hostility and greed causes pretty much all problems xD