Why are people "immature" if they think periods are gross.?

Referring to something as 'gross' is generally immature - referring to any bodily function as gross rather than accepting it as a normal healthy part of the human body, that is something you'd expect from a child and not from an adult.

Excrement and urine are not comparable to menstrual flow - excrement and urine are purely waste products, what is left over from used food by the digestive system and excrement in particular is full of bacteria, whereas menstrual flow is uterine tissue so more closely resembling skin or mucosa and although no longer needed by the body it's not devoid in value or used-up. Menstrual flow is what sustains life by providing support for developing embryos/fetuses, when shed it's a rich source of stem cells, thus in many cultures this blood is regarded as sacred.

Excrement and urine are not comparable to vaginal fluids full-stop - if menstruation is gross then by that logic so too is vaginal fluid, surely? Discharge that helps keep the vagina clean, so clean that it's cleaner than your mouth, fertile cervical mucus that's responsible for us all being here, are these substances gross or comparable to excrement too? Consider this very seriously, a guy calling menstrual flow gross is calling vaginal fluids and the female body as a whole gross, now do you see guys calling their ejaculate gross or their penises gross? Yeah I'm sure there are some women who would say male anatomy is gross, but it's not a socially conditioned response like it is with menstruation.

We may find excrement and urine to be 'gross' but then these things are not gendered; we regularly discuss bathroom functions or use toilet humor, while menstruation is still a taboo. The idea of menstruation being gross comes from centuries of sexism and shaming of the female body: the idea that women's bodies as a whole are gross, and that vaginas are gross. Messages about our genitals being 'gross', dirty, smelly, ugly, etc. are internalized in the same way as messages that fat is ugly or girls need big breasts to be attractive, it's specifically an attack on female bodies and as such against women by large. By saying that periods are gross, guys may as well be saying girls have cooties.

It's not just immature, it's sexism in practice as taboos have real-life implications, like women refusing to get help for serious medical conditions as they're embarrassed to talk to their doctors about periods, which comes from social attitudes backed-up by men shaming women by saying their periods are 'gross' whenever periods are mentioned. Literally men will say they're going to the bathroom for a piss or to take a dump, most people will use toilet humor, while women still hide their pads in the waistband of their clothing out of shame, and when was the last time men were expelled to a live alone in a hut, raped, or denied access to education because they needed to take a dump?

It's not just the function but about social attitude towards menstruation and why it's treat as something so 'gross' - the fact that men have been conditioned to think of menstruation as gross and that this then shames women from talking about menstruation: it's backing up taboos about women's bodies that have a direct impact on womens well-being.

Menstruation: It's Not Like Anything Else - http://www.menstruationresearch.org/2012/12/26/men...

Feminists did this.