"I never smile if I can help it. Showing one's teeth is a submission signal in primates. When someone smiles at me, all I see is a chimpanzee begging for its life." While this famous quote from The Office may be quite exaggerated in many ways, this can nonetheless be a very real attitude in some cultures. Smiling too much can make you look goofy and foolish at best, and outright disingenuous at worst.

Yes, globally cultures fall into the category where a smile is either a display of weakness or a display of strength. The latter are more evolved cultures. Of course too much is too much.