I operate on the assumption that the overwhelming majority of people are nice, though I’ve run into more than my fair share of strangers that are complete dickheads. It feels like I’ve run into way more people who treat me kindly than cruelly (but that just be my own biases affecting my recollection).
Problem is, interacting with other people is tiring and after a long day I just want to curl up and stop existing but people waiting for the bus want to chat and strangers stop me in the street to make small talk.