I agree with you for the most part, except for the Greers not being loving towards Russ.
@StinkySnack and
@The Littlest Shitlord both covered things pretty well, so I'm just going to say that Shit-Lips claiming to have not felt loved until his first time with a hooker has far more to do with Russ being a narcissistic asshole with a broken brain than it does with the amount of love the Greers showed him. Russ was likely born bad and his idea of being loved is for people to kiss his ass, give him whatever he wants, and agree with any asinine thing he says. He has no concept of actual love, therefore cannot recognize actual love when it's being provided to him. That's on him, not the Greers.