The source of Rosberg's irritation is obvious - Mercedes' ridiculous decision to let public opinion dictate their driver management. The team came under massive public and media pressure to treat Hamilton "more equally", even though they already had the policy of letting them race in place. Mercedes listened to it, started supporting Hamilton more, and Rosberg lost out when he should not have. He was clearly faster than Hamilton in Hungary, and obviously didn't want to jeopardise his race or Hamilton's with a risky pass. He only started to fall behind when his tyres went off. Hamilton stood to lose nothing by letting him through, since Rosberg had to pit again, but he refused. Afterwards, the team publicly applauded Hamilton, even though in everyone's interests to have him let Rosberg through. Hamilton cost them a potential 1-2, and Mercedes gave in to public pressure afterwards.