yeah, a cup of coffee in the hand is easily forgotten. How many of us will dial a call, unlock house/car, and do a million other things and realize "I still have a cup of coffee in my hand".
Toss in, if he STARTS to salute, then stops because of the coffee, then voila, he hates the troops.
FACE IT - this issue is being driven by RIGHT WING RADIO for good reason - They don't want to talk about the ISIS Syria bombings. If the bombings work, they want to be able to say of course they supported killing bad guys. If the bombings fail, they want to be able to say they were against it all along. SO spending half their show talking about LatteGate means they're not on record on Syria. It's just smart politics.