Considering that Starscream is in an all-but-sealed-off timeline which already has its own Megatron (and which is not the Megatron currently talking to him, unless said Megatron is interested in being dead within the next couple of days), he's probably not talking to Megatron face-to-face, and thus probably doesn't get to see the angry glare. But he can certainly hear the anger in Megatron's voice over the comm line.
«N-no, of course not! I would never dare presume to tell you what to do, Master! Please, forgive my error--I've been giving orders to the Vehicons all day, and clearly I neglected to, ahh, to properly regulate my tone for you. The Nemesis is under full attack by the Autobots and several Decepticon traitors, I-- I really don't have time to give a proper status report, sire!"