steve tries to leave when sam brings up being frozen, because that’s a sensitive topic (to say the least) for him, and sam knows that he probably shouldn’t have mentioned it, and he doesnt want to come off as someone who thinks of steve as captain america and not steve rogers, so he corrects himself, but not in a blatant way, he connects and empathizes with him, he says hey, you’re a soldier, i’m a soldier, i understand, i don’t want you to talk if you dont want to, but if you do, i’m here for u bro (warrenworthingtonlll)