Oh dear, what a first post on FT. Welcome to the community, even if it was driven by a poor experience.
To answer your question, no this is not the typical CW service you should expect. I don't think you did yourself any favours with the initial comment on boarding, particularly since everything you had experienced up to that point was well beyond the control of the cabin crew. I agree the crew could probably have been more helpful given the limitations on your physical capabilities, but it is true that they are not responsible for luggage and/or passenger assistance issues. I can't quite explain the tone taken by the cabin crew, as this is certainly unusual. Finally, and as others have said, what is it that you would like from BA at this point? After reading your excessively long letter, I'm sure they were as confused as we are as to what you are looking for, hence the call.