This brief interaction with a man I have never met before and will most likely never see again made me think. We shouldn't be so quick to judge people. Sure you can only make one first impression but that's not always the most accurate impression. We have no capable way of knowing what people are hiding underneath their surface until they open up to us. Until then we can't really judge people for who they are because we don't know who they really are.
It goes beyond people as well. We tend to close ourselves off to experiencing new foods or cultures based on appearances or smells. We don't allow ourselves to be fully immersed in anything because we make judgements without trying first. I suppose what I'm trying to get at, in the most cliché way possible, is don't judge a book by it's cover. Allow yourself to be surprised by everything life has to offer.