In some cases, sure, but I don't think we can generalise that or any other behaviour or mindset to all lonely men just like we can't generalise any particularly behaviour or mindset to all lonely women or lonely children of either sex.
While there are stats on people having fewer friends now than decades past, both women and men. I'm not sure if people are lonelier, or people's idea of what a friend and friendship is has changed over time and/or people are more open to talking about it.
I mean, it's pretty obvious from this thread that many people presume that someone - or at least a man - who is lonely must be a horrible person, must have committed some sin to feel that way. Culture has shifted so that being open to talking about things that others think makes you a horrible person has gained traction, so it happens more.
It also seems to bother some women a lot that some men are discussing loneliness, and I struggle to get why. If you don't care what men think because they're a bunch of murderous rapists, then why does them discussing anything about their feelings and experiences matter? If some women want men to be more emotionally vulnerable, why is some of them discussing loneliness - an emotionally vulnerable act - lead to what looks like an impulse to tear the idea apart? Why must it be something inherently wrong with men that explains this issue, an issue that women are also discussing experiencing? There are constant threads on here and articles either mocking or pathologizing men for discussing loneliness, mostly written by women. It seems bizarre to me.
I've been crushingly lonely both as a child and as an adult. I have never been shocked when someone doesn't want to open up to me - to me, that would be normal. I don't discuss my experiences of loneliness because I'm shocked by anything, but because I accepted it enough to be vulnerable about it. I'm never one to say I'm a good person, but I accepted my loneliness didn't mean I'm bad or an asshole - plenty of assholes have loads of friends, often with other assholes. Loneliness is a pretty normal human experience, and I think it's great people are talking about it, whichever sex they are, and that sometimes we talk about things to express and be heard, not because we're trying to 'fix' anything at the moment.