This is what mine does (I only keep one BP). Other snake species give different clues, and it usually takes me quite a while to figure them out (if I ever do).
As you get to get to know your snake, Ninaninanina, you'll figure out what it is trying to tell you. With one skipped meal, the snake is likely simply not hungry. It may be a sign that you're just feeding a little more frequently than it prefers, and it is sitting one meal out. Perhaps the last meal was just a bit larger than normal. Perhaps it is beginning a shed cycle but this isn't visible yet.
I'm not sure that encouraging a 'habit of refusal' is a worry; snakes don't seem to me to have that sort of psychological capacity. A keeper could aggravate the snake by repeatedly harassing it with food, though, and that wouldn't be good.