Listen, first you need to understand jeans come from plant fibers and man made material, so your wearing plants which sounds silly but we still do it. So material is the same for men and women.
Second, material aside, there are very few differences in men and women's jeans and men's skinny jeans.
Womens jeans do have a smaller pocket, smaller zipper, lower rise, and some bigger in the hips because most women have large hips/thighs. Rise and style vary like mens jeans so technically men could still wear women's jeans if finding the correct fit and rise for their body. Take the women's decal away and they can look nearly identical as men's jeans. It's all how you style with your outfit.
The same for men's skinny jeans. You could wear super skinny, or a loose fit waist with skinny leg fit but not skin tight more like a loose look. No they don't hurt a mans balls if you buy the correct fit. Some jeans have more flex so you now can run in them with little leg movement restriction, too tight is never healthy for anyone.
So why is wearing them frowned upon? I'm tall and thin. My legs are long, I have worn loose women's jeans and men's skinny, hearing people say skinny people shouldn't wear skinny because you look thinner makes no sense women do it all the time. For Men we wear loose shirts so this balances our outfit with thin jeans. If these are being sold clearly people buy them, and it's no longer a "gay" style. Years ago men wearing pink or purple was seen as gay, but now straight men wear them to business work or even casual shirts, nobody cares anymore styles always change.
I like the way some women's jeans fit my odd body measurements like Levis or American Eagle, and some styles of men's skinny jeans are comfortable and I don't have to pull them up like regular men's jeans that are so heavy in material and weigh me down lol.
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I wear skinny jeans once and a while but then again I don't give a shit if girls like it. Besides my best friend still wears skinny jeans ( and they are girl jeans that are to small) long after his emo phase and he still hooks up with girls that you'd think wouldn't be with him. So really most girls don't really give a shit, none of the girls that me or him associate with care.1