"That's probably for the best." He can acknowledge his limits (under duress, apparently, but still), and that he's definitely burned some sort of bridge with Bucky in all this.

When Bucky continues, though, he pauses to listen, give it his whole and genuine consideration. Because...

He presses his mouth, but the expression is decidedly more self-admonishing than outward anger.

"I..." the words get stuck in his throat for a moment, but finally he swallows and sighs. "You're right. I'm- I am treating you like you're being deliberately obtuse, but I- I'm the one who is causing this strife. I..." He lifts his hand to run through his hair, doing nothing to settle it from his fall. "I-I'm sorry, I didn't realise how much my circumstances have come to frustrate me, it wasn't fair to lash out at you for it."