Steve had gone to the conference room the moment J.A.R.V.I.S. had told him to, thinking there might be some sort of emergency involving Loki. After all, J.A.R.V.I.S. hadn't said why he needed to get there, just that he did.
Of course, when Tony strolled in casually, he immediately realized it wasn't a meeting about something horrific and he ended up sighing at Tony's sarcasm. "Your computer didn't say why we needed to be here, jut that we did." He and Tony may have reached an understanding after the fight with the Chitauri, but the man still wasn't what Steve would consider a good friend, even if he did admire his sacrifice. Which he would never tell Tony, of course. It would only inflate his already overgrown ego.