Ryanair are notorious for a) nickel-and-diming and b) general nastiness (e.g. charging a big fee to print a boarding pass at the airport, flying to an airport 70km from the city name they advertised, telling the press that they're going to start charging for the toilet). They're one of the few airlines whose reputation is big and extreme enough that it's percolated into the public consciousness.

I'll happily pay more for an Airbus plane or even an older Boeing model because I prefer not to crash and die.