I consider myself above-average in the honesty department, and occasionally I blurt out something over-the-top blunt, but I wouldn't look at pictures of someone's newborn and exclaim "Wow--it looks exactly like a root vegetable!" Which too many do, unfortunately. (Or a larva.) A little diplomacy greases the skids, and unless it's a moral/ethical thing, I try to err on the side of kindness.