I'm not going to speculate on where it originates from, I can't be bothered today. But one thing is for sure, crying is not socially acceptable behavior. It makes people uncomfortable, maybe that's why everyone shys away from it. Whatever the reason, crying is definitely perceived as a sign of weakness, the ultimate expression of weakness in fact. It's a taboo, people who cry don't want others to see them cry, they feel weak and vulnerable.

Well I'm taking a stand right now. I've been crying everyday for the past week. Now go knock yourself out.