To clarify.
In Ryanair the word "bars" covers everything related to drinks and food. It's a general term. Ryanair does not have permission to sell anything while the aircraft is on the ground. You need a specific permit from the country you are in, which costs money of course, to perform a commercial transaction on board an aircraft.
This is something passengers don't know or don't understand. it's also very difficult to explain to hungry passengers that you can't sell them anything because of some bureaucratic rule.
Journalists don't know this and don't bother to actually interview someone who knows the system. That's how you get these typical anti-Ryanair reactions from passengers or the general public.
It's pretty normal they diverted to Liege.It is a common alternate for our operations. Don't think it is the pilot's choice either. They were probably informed way ahead in time by Dublin operations they were going to Liege.
I work for Ryanair, I'm not a fan-boy of the company, I just want to point out that there's always two sides to these stories.