For Jason, it had nothing to do with gender roles, and everything to do with what had happened to him on the streets before Bruce had found him. He never talked about it, even with family. They knew, some of them, but the subject was largely forbidden. Jason didn't want to go back there. It certainly didn't help that his relationship with Bruce had first started to unravel when his restraint in dealing with pimps and rapists as Robin had begun to evaporate in his teens.
"It's not offense, Cas, it's ... I just have to be clear about this stuff, okay?" Jason would rather not explain his whole sorry tale to the angel if he could help it. "Not to mention you're probably way too old for me." That joke should be safe enough if Castiel took it literally, Jason decided.
He watched as the waitress finished taking Castiel's order, and bit his tongue on a remark about how Cas was a tricky bastard for dragging him out here and then not ordering anything to eat. Two could play at that game. Jason still wasn't hungry. The burger was for his dog.
"Three," he corrected, when Cas asked about his brothers, "and a sister. For a supposed loner, Bruce picks up a lot of kids."