In this case, the only thing to do is to ignore it. Responding to clueless people like that in public is not worth the effort. Alert them in IM instead, politly pointing out that they only make themselves look like ignorant and clueless idiots making public comments like that. As for the image itself: You wrote in your comments that you had problems with the ground shadows. Did you put the texture/material directly on the Poser ground plane? It appears that the ground plane often has a problem catching the shadows. Try to use a flattened box or a the plane from the primitives collection as ground, and the ground shadow might get better.