Is there though? Or is it just an arbitrary distinction indicating the level of dissent that we as individuals are personally willing to accept without being displaced from our comfort zones? Who gets to set the bright line for what level of criticism is acceptable? For that matter, who gets to determine what constitutes constructive when it comes to criticism? I suppose one could argue that a requisite for "legitimate" complaint should be the presence of an alternative, but even then a precursor to action has to be an awareness that there is an issue, and to those unaware or unimpacted that attempt to raise awareness may well sound like complaint.
