I would say this a sample of 1 - and from a biased source, too.
My daughter graduated form high-school last year. Not only had I not heard a single case of girls being refused entry to anything - most of the times it seemed like my daughter and her female friends (most of them straight "A" students in a very competitive high-school in the Boston, MA area) were almost harassed to join the math club, the robotics club, etc.
None of them had any interest - they all found it "boring". The reasons are complex and a another topic, but in short, part of it is biology, part of it pop-culture where "nerd"/"geek" is not something you want to be.
My daughter graduated form high-school last year. Not only had I not heard a single case of girls being refused entry to anything - most of the times it seemed like my daughter and her female friends (most of them straight "A" students in a very competitive high-school in the Boston, MA area) were almost harassed to join the math club, the robotics club, etc.
None of them had any interest - they all found it "boring". The reasons are complex and a another topic, but in short, part of it is biology, part of it pop-culture where "nerd"/"geek" is not something you want to be.