That's not an excuse. There wasn't a single sign of stress in the engineer's voice, and he was clearly sending the message as a response to readings the team had received. Raikkonen, on the other hand, snapped at him.
This is typical of the attitude I've encountered from Raikkonen apologists, albeit relatively minor; there were some who would defend him endlessly, regardless of what he does, even if a video emerged of him torturing puppies. To their mind, it's never Raikkonen's fault. If he snapped at an engineer, the engineer had it coming. If he caused a first-lap wipe-out, it's the track designer's fault for including a drainage gully. If he only produces two decent laps in fourteen Grands Prix, it's the team's fault for giving him a bad car.
Raikkonen wouldn't even be World Champion were it not for McLaren's driver mismanagement. He's not a legend of the sport - he's a guy who was in the right place at the right time. He is over-rated and seriously underperforming. If Ferrari are as serious about reform as they claim they are, they'll fire him. And the sooner he is gone, the better off the sport will be.