He barely moves back, but that's not the point. Steve gave him every out and yet he's still going. He doesn't care about him. Steve was stupid to think he ever could even for a second. "No, you're exactly like Fury. You push and push until I dance just the way you want me to. You don't give a fuck about what it does to me because I'm not even real to any of you!" He spits back angrily. His arms fall to his sides. Tony wants him to dance? He'll fucking dance. He charges forward and essentially throws himself into the other man's arms, using the momentum to flip him over and onto his back in the sand.
Steve leans over him and coldly states, "Ask for help, but don't ever talk to me again as your teammate. We're done." That's it for him. He stands up and walks away. He needs to cool down before he does something that can actually hurt Tony in his anger.