Jacob, as a fellow Professionalist, could easily feel Rita's frustration and hidden resentment toward her own incapability of not to be able to make her creation reach its full potential.
But he also looked down on her because of that exact reason, because it was also quite clear she had given up on it and had lost her vision as a true Gunsmith.
As someone who had devoted his life to perfecting the Killing Weapons and never stopped moving forward no matter what kind of problem he encountered, he abhorred those who just gave up too easily.
At least, he had this kind of mentality when it came to Gunsmithing. It was his obsession that never left him, even after he was reborn. He still wanted to improve it further and try numerous ideas, which he couldn't because of the technological difference between his world and this one.
