Just say yes I can read and monitor the patient at the same time. It's not malpractice. This guy got f'd by playing into the lawyers hands.
If the patient starts to desat and you say 'hold on while I finish this text' it would be a problem, but reading or texting from the O R doesn't decrease your ability to monitor the patient, especially if your alarms are on and set to go off within a reasonable range of changes.
And just say 'yes, i sometimes post on facebook, it takes 20 seconds, i look at the monitor every few seconds while posting, and nothing is changing or i would stop posting,' then there would be no reason to discuss the lice thing and make you look like a d**k.