Bruce was grateful that Tony seemed to be looking out for him and had him over by his bed, even if putting Bruce in this situation to begin with was entirely Tony's fault. He just stood around awkwardly giving weird smiles to the newcomers with his hands shoved in his pockets. He had never been the best with people to begin with and the trial and subsequent self-inflicted hermitness hadn't really helped his social skills. He hated being in the room with all of these strangers, but he was going to bear it since Tony got shot and everything.
Eventually when the table seemed clear of people he wandered over to the table and made himself a plate. He might as well eat.