Why are vulvas offensive here

Mi
So women are told their vulvas are all awesome and beautiful here, then as soon as one posts a picture with a question, the shocked TMI or "I don't wanna see your vagina" ewwww comments pour. 
I don't get it. 
I won't be posting mine, but none of yours offend me in the least. If as women we cannot look at a vulva and not cringe, what can we expect from others.