It's honestly like comparing a minimum wage worker to a homeless person, both are obviously not in ideal circumstances but there's clearly a huge magnitude of difference between the two.

A single "alone" women will always have access to sex and transient physical intimacy, she is rarley if ever touch or attention deprived. She can also gamble with the market and land a relationship if she's honest enough with her standards and persistent.

A single "alone" man however is not going to be getting much sex if any unless he's very attractive and he's also going to struggle immensely to get a relationship when he can't even get sex or consistent enough dates. This leads to severe touch and intimacy deprivation that causes many psychological problems.

This is why single women don't have much issues with being alone since they don't really experience the full impact the same way men do and have most of their base needs met.