People are far too wrapped up in the contemporary social representations (Moscovici, 1978) and norms of the dominant society. We have become too afraid to be different or unusual. Every action has to be evaluated for undertones and consequences or one risks being seen as over-confident at the very best and abrasive/creepy at the worst. It has now become taboo to talk to a stranger, not in a creepy want-to-hit-on-you way, but just in an honest, this-is-what-I-was-thinking-and-thought-you-might-be-flattered way. Now, I am not advocating for people to run through the streets naked and scream offensive things at random strangers, but I am impressed at how socially segregated society is. Even “social” media such as Facebook have potentially stricter codes of behavior than the “real” world (i.e., it is inappropriate to talk to a stranger on site designed with the intention of bringing people together).
Perhaps seemingly paradoxically, I think that there should be a level of decorum maintained, i.e. treat people how you would like to be treated and if you don’t have anything nice to say don’t say anything. But, apart from that, we need to get out of our social in-groups and talk with an out-group or we will risk social and mental groupthink.