- I know more women who knit than men
- I know more men who follow football and basketball than women
- I know more women who write novels than men
- I know more women who enjoy romance novels than men
- I know more men who enjoy horror films than women
- I know more women with an interest in fashion than men
- I know more men who play computer games than women
- I know more women who play cellphone based games than men
EDIT: To underscore how exceptions matter: I know how to knit, but I find it interminably boring. I don't follow football; my mom does. I enjoy romance novels and hate horror films. I'm an oft-maligned cis-het male.
There are likely lots of historical, social, and cultural reasons why knitting happens to be more popular among women than men -- reasons that might go back to our hunter-gatherer days, when the stronger, more physically capable men were the ones going out to hunt while women stayed home and took care of, among other things, the creation of clothing.
I wouldn't describe knitting as a flow state in the same way. I frequently listen to podcasts, watch movies, listen to music, etc, when I knit. Knitting is... I dunno... rhythmic?
Now granted that depends. If I'm working cables or some sort of motif or whatever, it can require a bit of focus. But it's definitely not the same as coding. And if the fabric is simple stockinette or something, I don't even need to look at my hands.
It's also not at all solitary unless you want it to be. Knitting circles are a very common thing and I personally love hanging out with my other friends while we each work on projects.
In short: my guess is your confusion is mainly borne of a misunderstanding of the hobby.
My suggestion? Give it a shot! YouTube has made it easier than ever to learn, and a pair of sticks and a ball of yarn will cost you less than ten bucks. You never know, you might love it!
Creative hobbies do tend to be a bit male-coded or female-coded for various reasons. For some hobbies I suspect that the very single-sexiness of the hobby is part of the appeal — women join knitting circles as an excuse to hang out with other women, men go golfing as a way to hang out with other men.
The data, however, indicate that, at least in sum, culture contributes negatively to differences, that is it makes men and women less different than they would otherwise be.
That apparently was expected by no-one.