What did Soda say that Pony had a hard time believing?

Soda says that Pony has a hard time believing that Darry loves him.... and that Pony doesn't care about Darry.

"Listen, kiddo, when Darry hollers at you... he don't mean nothin'. He's just got more worries than somebody his age ought to. Don't take him serious... you dig, Pony? Don't let him bug you. He's really proud of you 'cause you're so brainy. It's just because you're the baby--- I mean, he loves you a lot. Savvy?"