There is a difference between "everybody should walk on eggshells" and "there should be standards". It's not black or white, "eggshells" or "f* you I can say what I want", there is (millions of) middle ground(s). HN has rules and guidelines about how to reply to people ( http://ycombinator.com/newsguidelines.html ). Does that mean "everyone has to walk on eggshells around here"? No, there are rules, but it's not mad. Hence the existence of rules does not mean "everyone has to walk on eggshells".
Actually, yes, people do have to walk on eggshells around here. I am walking on eggshells right now for I can not express myself freely in a forum like this without suffering from social manipulation (downvoting, hellbanning). And this is while adhering to practices such as "no personal insults". In a place like this, you get banned for disagreeing, let alone speaking in an "unapproved" way. This place is hardly an example of civility.
I agree that there is a middle ground - when someone's quality of life is seriously suffering because, for example, someone is shouting abuse at them all day then something must be done. However, taking serious offence at people's ignorant opinions or ways of expression is unwise and in itself ignorant.
I'm anticipating prejudice so I shall address it pre-emptively - I am, in fact, a minority. In many places on this planet, I risk serious injury just for being what I am. People have expressed extremely ignorant opinions about the group I fall under in workplaces. I initially took offence upon hearing what I heard but then I moved past that stage and accepted that one cannot understand something they haven't dealt with directly. They were not trying to be mean, they merely did not understand because of their limited experience. How can I take offence when this is the case?