This is overstating it. Computers are amazing machines, and modern operating systems are also amazing. But even they cannot completely mask the downstream effects of poor quality code.
You say you don't care, but I bet you do when you're dealing with a problem caused by poor code quality or bad choices made by the developer.
Yep willing to bet that the majority of people saying "users don't care how well the code is written" will crash out when some software they're using is slow and buggy, even more extremely if it glitches and deletes their work.
Just like how most people don't care how well a bridge is designed... until it collapses.