Rather than a legitimate complaint, it reads more as an excuse.
If they're resorting to blaming and hating the opposite sex, then no, they are not trying to better themselves. You can't improve yourself if you're assigning the blame outside yourself.
> Accept they were born unattractive - then what
A lot of shitty cards are dealt in life. Being unattractive is just one of them. Yes, accept and move on.
Accepting you were born in a way that doesn't conform to your ideal is I think natural for any person. I'd wager most of us aren't built to the spec of an idealised representation of ourselves. Part of growing up is accepting that this is the case. The step after that is getting on with your life - why would it be suicide?
A side effect of that mindset is also increased attractiveness to both potential partners and other social contacts in general.
It's just a subculture don't take it too seriously