Boredom is merely lack of engagement, a two-way street in terms of responsibility. Are there boring classrooms? Yes. There are boring drills, boring lectures, boring warm-ups--and any number of boring instructional strategies (i.e., worked examples in mathematics) that yield some learning benefits. Daily practice of musical scales isn't much fun, but it's an enormously effective technique-builder. Brushing your teeth is boring, too, but that doesn't mean you should stop.