Watch the rat’s M.O. He makes a beeline for the cat’s food, which suggests he’s done this many times before. Someone he knows the cat won’t try to stop him: if anything, the cat acts like he’s been completely buffaloed. How does the rat know that cat won’t suddenly run out of patience?
I’ve had cats who would run away from a rat. I’ve also had cats who’d play with one. They’re all different–just like people.