Eurocockpit.be has a dedicated page for this - "The Hall of Shame". There are a couple of well-known brands lambasted on there. However, they are just a tiny fraction of the overall number of employers who showed no sympathy for their crews.
On a positive note, the opposite is also true. Some of the best examples out there aren't widely known in the industry. Often they are small, family-like companies with just a handful of employees who know each other very well and have excellent relationships among themselves and with the management.
Unfortunately, thinking that the attitude of any company to its employees will have a major influence on consumer choice is a bit wishful. And this isn't specific to aviation only. Do people care all too much about those who produce the clothes they buy and how much they get paid? What about the workers in the farms producing what will become your well done steak tonight, does anyone think about their wellbeing when buying meat? And what about the bus driver taking people to work? How many of them think about his work-life balance when travelling on the bus? The same goes for airline crews. As long as the flight is cheap and convenient, most wouldn't even think about who will be in charge of it. If the on-board service is also good and the timetable is strictly followed, the airline is good enough for 99,9% of the travelling public, no matter how it treats its crews.