Part of the difference, in my mind, is because women are single by choice but men are single because no women will date them. Forever single women have often dated before, many times, and found it to be boring or too draining to justify continuing. Single women are independent, self sufficient, and in control of their lives, happiness, and futures.
Single men are single because no women will put up with their shit. They don't want partners, they want mothers, therapists, maids, and sex dolls all rolled into one. They don't want an equal partner, they want a servant who will be completely subservient to them, it's why they often go for women much younger than them, they think they can groom them into the servant they want since women their age have already developed a sense of self worth. Men like this are the ones living off takeout on disposable cutlery and plates because they can't be arsed to do the damn dishes.