Simurgh
Atheist Triple Goddess
I went to a girls school and had a very different experience. I was never made to feel like I could not do something because I was a girl. And from listening to other people's experiences I probably would have had a terrible experience at a mixed school and I'm very grateful I never went to one.
From my experience it seems girls are more accepting of each others differences when there isn't any boys around. Even our lesbian and bi girls were pretty much accepted, some being very popular in our school both friendship wise and romantically.
Yes, you are right, research has shown that girls benefit from being in a same sex educational environment, while boys don't. apparently they benefit from social interactions with girls.
It always seemed to me that girls by themselves are more accepting of difference until they are taught otherwise. then again, given that the female is considered to be the lesser human being and it is an insult to be told that one acts like a girl (in any way shape or form) when one is male it seems only obvious that an effeminate boy would suffer terribly, and so would anyone who would incure the wrath of the popular boys if he was thought off as gay.
After all, males constantly think htey have to prove their manliness--probably because it is a learned behavior.