[All of a sudden, articulating "he talked shit about turtles" in text makes it seem a lot more stupid than the very real and legitimate concern that it is.]
I think he thinks that if the opportunity's there, you should take it. And turtle-related knowledge isn't really a prerequisite for mafia life. He didn't really shoot you over turtles, did he?
It was probably just a figure of speech, but if he's gonna say things like "we used to beat up kids like you and steal their money" just because someone likes knowing facts about a thing they're interested in, then he's going to find out that sometimes the nerds hit back. That's all.
I don't usually get along with people who talk about stepping on those weaker than them.
[Which makes him smile. Not because he's particularly interested in Mista getting beaten up, although Mista, like Jotaro, can handle himself, but because Jotaro is perfectly right. Weakness is no excuse for violence; this is a lesson that a violent lifestyle sometimes makes it hard to learn, but that's no excuse.]
[And, of course, that's not the truth of Mista, not even close, but - well, talk shit, get hit. So it goes.]
Passione is, at least for the moment, still a place where strength rules over compassion. It's changing, but learning takes time.
Still, sometimes the best way to learn is to have lessons beat into you.
Page 4 of 46