Talk:The Propagation Proposition/@comment-36095489-20190117183156

Sheldon was his typical asshole self, thinking he was better than Leonard as a sperm donor. Yes, Leonard has his faults as all humans do, but Sheldon has a tonne more.

Sheldon always was a jerk to Zach so he actually very much deserves this. Leonard genuinely tries to be a good guy. In the episode where they all bully Zach, he's the first one to actually take Penny's words into account and decide to apologize.

Sheldon is a textbook narcissist with a humungous ego, sexist, biased, mean-spirited to anyone who is less smart than him, manipulative, immature (he still expects to be driven everywhere), and for a long time, I thought he might have been a sociopath. So yeah, I don't blame Zach for deciding to choose Leonard over as a donor.