Of course a person can multitask. I do it all the time.

In the olden days, I'd work crossword puzzles during class lectures. The pace of the lectures was always too slow to keep me occupied, so I had to do *something*. But that wasn't multitasking, like I do now. Monitoring the boys' race with the dog whilst cleaning the kitchen whilst watching/listening to the ball game, whilst printing out my work papers is typical.