I'm not attacking them for having a Feminism Society as such. In the OP I simply drew attention to the report that boys from the society explored the topic of gender ideology with girls from another school. They may have expressed largely gender critical views for all we know. However, the wording of the report left me a bit sceptical about that.
First up, the secretaries of FemSoc at Eton, Greg Weaving and Arthur James, spoke about gender theory, and how one’s gender can act as their identity, with the perception of transgenderism gradually being more widely and positively perceived in today’s society.
I have no beef with single sex schools, btw. I went to one myself at secondary age and so did both my children. I feel very fortunate to have had the opportunities I did. Half the girls in my year at school went on to do STEM degree subjects. From memory, something like half the boys at my son's school took at least one modern language to AS or A level. Both pretty unusual in co-ed schools.