"When would it have been a good time to tell you I lost my arm in the war?" Bucky snips. He's not raising his voice but he's clearly mildly annoyed. It's perhaps more frustrating from Arthur's point of view that Bucky of all people should be compassionate and understanding of what it's like to have to struggle with things that other people don't have to, to be kind and more forthcoming, but Bucky has always been 'super' ever since he lost his arm. He's never really understood half of what being in Arthur's shoes might be like.

He doesn't correct what John has observed even though he doesn't think the kid is entirely right. This place isn't all that foreign to him. And it's not fair to bring up what else Arthur might not know. Nobody here knows so many things about anybody else. He hasn't pressed Arthur for too much information and part of the reason Bucky spends time with Arthur is because he doesn't get pressed for information in return.

"I don't want to be the guy from the future with one arm. I'm just Bucky." He can't be just Bucky with anyone else who makes their assumptions with one glance. Can't he have that much?