Mr 16Years rather put his foot in it.
He's often on his phone during meetings (I don't mean, he's talking on it, I mean he's typing on it, like he's messaging someone).
A couple of weeks ago, during a meeting of the team, he was once again fiddling on his phone instead of paying attention. Senior (whom he absolutely loathes) watched him for 10 solid minutes and he never once looked up from his phone. So she flat out said "Please put away your phone and pay attention". He put the phone away, but he was staring daggers at her for the rest of the meeting.
Right after that meeting was another meeting that they were both in. Senior arrived a little late and upon arriving, opened up her laptop to retrieve the template for a certain type of document, so that she could compare the document up for review with the template to make sure it matched. Mr 16Years saw her open her laptop and immediately announced in a snotty tone "Please put away your laptop and pay attention". Senior looked him right in the eye and gave him a verbal smackdown of note.
After that meeting, Senior dropped by the HR office to let them know that there might be another complaint coming their way about hostile work environment or some such from Mr 16Years. The head of HR just looked gobsmacked, as Mr 16Years had not 5 minutes before going to the first meeting, been in a meeting with HR about his excessive phone usage during meetings. I guess he was on his phone texting his lawyer about suing the company.
Mr 16Years was in a sullen rage for the rest of the day, and is still sulking days later.