Contrary to what Rebecca believed in, Leila is quite tolerant on this kind of matters. She cares not of others looking down on her and of her people. As long as they don't blindly find troubles for them, she could turn blind eyes on them as long as she could.
Besides, Marvin's attitude is quite understandable. According to Aljur, almost all military men suffer from hubris. Prideful of their position and profession that they sometimes unconsciously dismiss others outside their circle. He even pointed out that this was a result of culture inside the military that often made them unable to see things outside their own perspective.
And on another note, the man is hardly harmful to them. Although on the virtue of his age and experiences, he has nothing that can endanger him as far as Leila could see. If she could describe him as, he is like a small puppy that is full of mighty roars but little power in the face of them.
