GGG rejected by girls

Self pity, is harsher towards others naturally due to his emotions even if he doesn't realize it.

Of course he is. He doesn't have what he desperately seeks (and that's why he's alone) and other people in a relationships are often bragging about it everywhere...

Bitching about it to strangers on the internet. Just being repellant in general, yet not realizing why he can't find someone willing to eat a free meal with him.