Why was the comment that said “Don’t format a floppy at the same time” funny when talking about threads and processes?

In the early days of Windows, a floppy could be crashed when the formatting process was interrupted because of the floppy disk itself was still moving. So, if the ‘multitasking operating system’ Windows really executes a different time consuming task, you had to throw away your floppy. So the funny thing is, that Microsoft called that mess a ‘multitasking operation system’.