So many developers say "clean code" when they mean "familiar code" and "familiar coding patterns". One person's clean code is another's heap of spaghetti. Idioms (like Duff's device, assignments in conditionals, function chaining) can be clean code if you apply it appropriately and your developers recognize it. Strict class hierarchies can be dirty code if you need to move gigabits in real time with 10 µs latency.

Kids don't like broccoli because they haven't tasted broccoli.