Europeans with adult stable jobs fly Ryanair and Easyjet because this is the best that they can afford on European salaries.
Not really. The difference isn't even that big compared to legacy European airlines these days. Ryanair doesn't do bottom barrel (eg €5) pricing anymore and the legacy airlines also charge for extras now like checked luggage and sometimes even carry on.
I just fly Ryanair when it's convenient due to time and routes. I honestly don't care which airline I'm on. In fact I like Ryanair because I can just buy the foods and comforts I want like priority boarding instead of having to get some pompous frequent flyer card from the legacy airlines.
Nonsense. It's because they're sufficiently cheaper on certain routes, and when you're taking multiple trips a year, the price difference accumulates; and also because they have very good point to point service, so if you live in a non-hub for the national airline city - a Bordeaux, Lyon, Birmingham, Manchester, Edinburgh, Hamburg, Köln, Varna, etc, your flight options are a flight with a connection in the hub, or a direct flight with a low cost carrier to a destination.
I've never once seen people fighting or screaming on a cheap flight.
For long haul I have no problem going with better airlines (which still means European or Asian over US carriers every time...).