Lawsuits is how society distinguishes the actual social contract from wishful thinking. You are free to establish your own imaginary community based on imaginary rules of etiquette, but everyone else is free to ignore such "rules".
Sure, but people whose behavior is only constrained by law rather than the general expectations of good taste in their community are generally referred to as assholes or with some similar term to indicate that their behavior is disapproved of but not to the extent that it would make sense to prohibit.
