why do people hate crying?

an argument i see for some hardships men have is that they're not allowed to be emotional or if they are it gets a completely different reaction,i find this to be partly untrue because women/girls aren't really either,atleast from my experience.i once opened up to a guy about the fact that for two months i'd been crying myself to sleep (with no clear reason) and he just said "are you on your period?" not for two whole months dipshit. so either way crying/showing emotion gets you nowhere regardless of gender.