pd2:
The reasoning as to why you were asked to move isn't the most interesting item in your post, its that you were requested to move by a Cabin Crew member AND REFUSED??
Understand that I'm not a defender of Cabin Crew at all costs. In fact, I've been tad disgusted reading Cabin Crew members defend the absolutely abusive and dangerous behavior of the nitwit from JetBlue
That being said, when you step onto that aircraft there is a food chain...and you're not at the top of it.
If you have a problem do what a reasonable individual would do...follow the order and then write to the Company for clarification. There are security reasons that may have been the source of the Cabin Crew's request (my husband has been on the receiving end of one of those..the Crew simply quietly moved some individuals to new seats...a few minutes later security arrived to remove an individual from the plane).
To simply say "No", never correct.