Your cat doesn't care that you're tired or want to read the paper, it's hungry and not gonna let you rest until that food dish is full. Even then, it's probably still going to later dart between your legs as you walk down the stairs. That's just your cat's natural dickish behavior. Don't fault them for it, something in the feline DNA compels cats to be indifferent jerks roughly 80% of the time (yes, we made that stat up). Cats can be real jerkwads and we've got the evidence to back it up.