Shouldn't Paulie know about shrinkage?

He makes fun of Christopher's likely flacid penis size. But this is no way to judge the size. Shrinkage occurs for various reasons. Being on drugs, being in a cold pool, etc... can affect a flacid penis. However, this shrinkage is eliminated if you are erect. Shouldn't Paulie know this? You cannot calculate a penis's size simply by looking at it while flacid, even with computers.