You assume that public transport seats are more comfortabnle for women than men. On what do you base this?
I gave some of the reasons when I described how spreading ones legs is a postural response to unsuitable seating. But I'll list some.
I'll start with seat height, which you allude to below. Seats on public transport are much lower to the ground than is comfortable for most men because of the very need to cater to very short people (mostly women) and children. I take public transport to and from work every day. I have never witnessed a woman's legs dangle because the seat was too high, on a bus or a tram. If such a thing did occur, the person would have to be exceptionally short.
When seat height is too low (as it is for more men than women), your thighs are raised off the seating surface and not supported. If you've looked at recommended seating posture in offices, the recommendation is for thighs and the upper leg to be parallel to the ground. It is painful to sit with raised thighs for extended lengths of time.
A second issue arises from the first: the seat length is far too short for most people, let alone most men. The reason armchairs are nicer to sit in than dining chairs is not only because they are padded, but because of the seat depth. Some public transport seats are so shallow it'd be fairer to call it 'perching' rather than 'sitting'. The seat length is short, probably for economy of space, but it nevertheless affects men more. Men have longer thighs and are more likely to be obese than women.
A third issue is the seat pitch (the distance between a particular spot on the back of one seat and the same location on the back of the seat behind/in front). Men have longer legs than women and this results in less leg room.
I don't know if you've sat on a seat where the seat in front of you threatens to destroy your kneecaps, shins, and sanity. From the sound of it, I'm guessing not. But if you have, can you imagine how much worse it is for anyone taller than you?
Do you know how uncomfortable it is to sit in chairs where your knee joints are made to dangle because your feet do not tough the ground? It is extremely uncomfortable and, on long rides like airplanes, it is painful.
Dangling legs is uncomfortable which is why planes provide footrests for shorter people (though this really isn't possible on some other kinds of high-movement mass transport). However, only people of exceptional shortness have dangling legs on public transport.