You've all seen this picture:
My guess is if I posted it as a part of a discussion of his policies, no one would bat an eyelash.
Let me give you another:
This one got some complaints among the pundits.
And then there is (no pix, because I do not want to) Katherine Harris, where I think that a number of people argue that dissing her for her cosmetic habits would be a disservice to the real evil that she did.
My rule of thumb generally is to be comfortable with it when it is done to a man, but not to a woman, because an attack on a man's appearance, for example poster child for sex without partners Mitch McConnell, is simply being nasty. It does not serve to marginalize them in other areas, while with women, the immediate critique seems to be appearance when one has a difference with them in some other area.
So, what are your thoughts.