He always does this, and Steve always manages to get angry about it. At least back home, the other one was a little less forward. He's honestly thinking that this one just adds a flirtatious component for the specific purpose of making him feel uncomfortable.

He wonders if, perhaps, either this Tony is inherently less faithful than the one he knows, or if his Steve Rogers is just so exceedingly heterosexual that Tony thinks this tactic is going to work to piss him off when they're the emptiest words he could've pulled out. Well, aside from mentioning the alcoholism. Now that was actually something that could have possibly gotten Steve to stay angry.

With his touch shrugged off, Steve naturally moves his arms to cross over his chest. "I don't get stood up." A beat. "But fine. I get it. It's not gonna work. Why are you angry with me? Not with him."