Bucky Barnes (MCU) & Tony; it's a cold and it's a broken Waluigi
It was going to come up eventually. No matter how successful Bucky was in being able to avoid Tony Stark at all costs, they were literally trapped in the same town. Unless Bucky stayed locked in his flat forever with a 'Keep Out Tony Stark' sign on the door -- and let's be real, that would likely only entice Stark to force his way in -- Bucky was eventually going to cross paths with him. That moment happened to be now, at the bar opening. Probably the worst timing ever. Definitely.
Apparently neither of them wanted to talk about it but it was going to happen anyway. Bucky's heightened senses had him very aware of the alcohol on Stark's breath and that wasn't exactly helpful either. A flash of jealousy sparked through him; damn, he wished he was drunk too. A drunken skirmish could be broken up and rationalized pretty simply. But Bucky wasn't going to come out of this as the non-aggressor unless he just took whatever it was Stark threw at him at this point. Granted, his words didn't sound all that accusatory at the moment. It was almost like he was trying to brush it under the rug.
And honestly? He wished he'd thrown a punch instead.
Dismissive behavior wasn't uncommon. It was way easier to brush things off like they weren't important than to address them head on. Bucky was kind of a master at that. But not about that. The culmination of events was horrific. It put people in prison who didn't deserve to be there. It forced Steve to drop his shield and the three of them had beat the hell out of each other. Steve and Tony's connection broken for a long time after. The only thing Bucky had to thank Stark for out of it was that he got rid of that awful bionic arm the he held so much resentment toward. His shiny new Wakandan made fingers clenched around his beer.
"Mistakes," he repeated the word. "Is that what you're going to call all of that? Really? Mistakes? Mistakes are when you marked a wrong answer on a test in school, or you wash a red sock with your white sheets because you don't know how to do laundry in the 21st century. Not the same as Siberia. You know that."