I would probably say that Morty is likely on the Autism Spectrum. Mortimer 'Morty' Smith Does Morty Smith have autism? This is the same drool we constantly see at the lips of Rick. The evidence that makes this theory even more convincing is the green drool that pours from Morty's mouth as he withdraws from the tree seeds. In order stave off the side effects, Rick drinks the potion constantly. What is that green stuff on Rick's mouth? When Rick is talking to Toxic Rick about his flaws, he points out his stupid obsessions, being right when Toxic Rick gives himself so Morty can be saved from pain. Since toxic Rick is a part of Rick, it's safe to assume Rick loves Morty.
