This conversation is from a tv series, Modern Family, and Manny(boy) comes into a room looking cheerful and talks to his step-father (Jay).
Manny: Hey Jay! Have you noticed a spring in my step?
Jay: Oh, kids say cruel things. That doesn't mean you'll turn out that way.
Manny: (frowning) No. We have something in common. I'm seeing a younger woman.
Jay: How much younger are we talking about?
Manny: 13 months. She makes me feel like a fifth grader again.
I know what "spring in one's step" means - you're walking lightly and it shows your happiness etc. - but I don't understand Jay's remarks following Manny's line. Turn out what way? How has Jay understood Manny's words so that he answers like that?
I mean, I can guess Jay presumed "a spring in my step" to be an insult from one of Manny's peers mocking the way he walks rather than understanding the idiomatic meaning, but I don't understand how Jay understood it. What does "spring" mean here, then? Is it "flexibility"?
I also saw an article saying that the writer of this episode is a lesbian, so there were several gay jokes in it, including this one about the spring in his step, but this just confuses me more. How is it a gay joke? How should I understand this to make it qualify as a gay joke? (I'm not sure if it's relevant, but just so you know, neither Jay nor Manny is gay in this show.)