male loneliness is bs because it is codeword for "I want a prostitute who is 24x7 available and also is my domestic maid"
In the nicest way possible, no it isn't. Roughly 10-20% of the U$ population has zero close friends, slightly favoring women (I didn't find data on non-binary people, sorry!). Most reporting I can find (feel free to contradict with your own data) focuses on the lack of male-male friendships and the causes thereof, while the lack of dating or romantic experience is used as an example of the consequences. As the rates have been correlated for quite a while, I doubt gender-specific loneliness has fully specific causes that are not shared.
CW: Self Harm/ Misogynist violence
Reporting favors cis men both because media focuses on male problems, but also because they are much more likely to kill or harm themselves and others.
Also, shockingly to hopefully no one here, poverty and disability correlate heavily with loneliness.