@oddtail They exist, but a person has to be lucky to have those.
I think it makes sense, but it's a harsh thing to say and has a strong component of victim-blaming.
It's hyperbole, but I don't think it's entirely untrue, even the harsher interpretation than what "compassionatereminders" is offering.
I read it as "if you will not fend for yourself, who will", and it's not fair in any way, and I'm not sure how actionable it is as advice, but I think it is trivially true that someone who actively goes out and makes friends will have more friends all else equal, and that requires a certain level of confidence, believing in yourself and vouching for yourself.