Not exactly sure what you mean by unaccomodating. The people that were kicked off the flight last night, the three ladies, were non-revving. This is when you travel on a space available seat basis for little to no cost. My dad was a pilot and we used to non-rev all the time. What the gate agent was saying in that situation was 100% accurate.
When you are non-reving, you have no rights because you have paid nothing to travel. You must be gracious and if they tell you to get off the plane, you must do it with a smile. My family and I were asked to get off a plane a couple of times after we had boarded, sat back and buckled up. It is just part of travelling as an employee. One year coming back from Orlando with my dad and brother we got passed over for every flight and sat in the airport all day. The last flight left, without us and we were stuck. We ended up having to rent out the hospitality suite at the Airport Marriott since there were no other rooms available. Part of being in the airline businsess. The upside, except on Southwest, is if there are seats available in First class you can go up there and get the full service.