Good for Ryanair, but if only they were consistent on safety. In the past I've heard complaints that they don't make sure children are seated with parents in the boarding rush - which is a safety issue and that they let people sit next to exits who can't understand the briefing given to them on emergency use and/or aren't the most physically suitable people to be seated next to them either.
I was pleasantly surprised to see the reference in the T&Cs, but if I remember the last time I flew Ryanair plenty of people talked through the safety demo.
Hope this guy loses though, it does look like he disregarded the request to be quiet...which is very naughty.