Shepard was by no means offended, she knew aspects of human nature too well to be. Id played much bigger part in human personality than in personalities of other races. They used to be lords of the creation, back on Earth, and old habits were really hard to kill.
She didn´t quite agreed with Zeto in her opinions. "Rushing can get things done, yes, but there is no guarantee it will they will get done well. With age comes the wisdom and I think humanity is quite lacking it. 
Look at Asari, their lifespan is a thousand years long and their culture and peacemaking politics could be an example to us.
I don´t think that humanity needs to rush right now. In past hundred years we had technologically developed more than we could in a thousand. Right now, we should slower a bit and let things settle. We are still same people, but the whole world, whole universe is different. We have to change our ways or we will soon be in dustbin of history. We are trying to conquest the universe like we conquested Earth, but I don´t believe it will work this time. And failure could be fatal..."
Shepard took another few bites of her rapidly diminishing rations before speaking again, now in more lightened voice. "Look at us. Soldier and medic having an intellectual debate worthy of philosopher or psychologist. If one more smart thing comes out of my mouth, I will start to think that military career was a bad call after all..."