Economic Man sounds like a misinterpretation of rational behavior. By definition, it assumes perfection, yet economic behavior doesn't. I'm not sure why anybody would use Economic Man for anything other than an abstract model to aid explanation, not be a representation.

Rationality in economics addresses the consequential nature of behavior. It isn't wisdom or objectivity. An example of rational behavior is my browser bookmarks. What they are and their arrangement is caused by and effects into rational decisions I have made regardless of whether they're "right" or "wrong". Capitalism is like that, socialism is like if we all have the bookmarks chosen and arranged based on an external principle not related to cause and effect

I'm not sure if that makes sense. Regardless, in the real world, an "economic man" is somebody whose decisions have some sort of rational and consequential link. This includes everything you can think of, from drug addiction to choice of anti-virus software. The socialist view is to eliminate causal chains