It is unfortunate that we aren't all more open to give & take in this Modern world, especially the off-line world of day-to-day life. Whether it's Whole Foods, Saks, WalMart, Goodwill or waiting for a bus; there's not nearly enough direct human interaction, and kindnesses exchanged with the strangers we are among. Smiles and polite greetings, some unsolicited assistance - compliments -comments are really the most important things we do for ourselves and society. They matter more than we can know too, as examples to others - especially children & the down-trodden. These acts feed the circle of whatever you want to call it... "pay it forward", "Christan charity", "giving back", etc.
This does not mean syrup-slathered "I love you man" sentimentalism. It also does not mean, necessarily, turning the other cheek until you require hospitalization. Polite but respectful & firm, suites and serves civilization better. And it is a healthier social diet, if we all wish to grow up to be wise and strong human beings, defenders of the weak and children of God.
I do my best to practice this in all my interactions, off & on-line. And I hope those strangers I meet will strive to do the same... and gently remind me when I'm failing in this, too. It's just common courtesy, and a kindness owed to strangers.