if that thing isn't wider than 468 and isn't taller than 120 then you're fine and tell that member to shut the heck up. We've already had one member go on sig patrol and make himself look foolish from such a mistake.
same dude who made a fool of himself before. Just ignore it. If it was wrong then the mods would have taken care of it. That dude obviously doesn't know how to interpret the rules, nor check the size of an image.