Is any group of people more self-deluded than committed multitaskers?

Nass assumed that people would stop trying to multitask once shown the [detailed, irerefutable!] evidence of how bad they were at it. But his subjects were ‘totally unfazed,’ continuing to believe themselves excellent at multitasking and ‘able to do more and more and more.’ If individuals in a controlled experiment are this oblivious and refuse to change when confronted with proof of their shoddy performance, then what hope do the rest of us have as we wade through the daily sea of digital distractions?