Appendix 1 to EU-OPS 1.1005
Initial safety training
...The subjects that must be covered as a minimum by a course of initial safety training referred to in OPS 1.1005 are:
(e) Passenger handling:
4. the importance of correct seat allocation with reference to aeroplane mass and balance. Particular emphasis shall also be given on the seating of disabled passengers, and the necessity of seating able-bodied passengers adjacent to unsupervised exits;
Hmm so it seems the Cabin Crew Member was doing their job, according to the applicable law ...
EU-OPS 1.090
Authority of the commander
An operator shall take all reasonable measures to ensure that all persons carried in the aeroplane obey all lawful commands given by the commander for the purpose of securing the safety of the aeroplane and of persons or property carried therein.
EU-OPS 1.085
Crew responsibilities
The commander shall:
3. have authority to give all commands he/she deems necessary for the purpose of securing the safety of the aeroplane and of persons or property carried therein;
4. have authority to disembark any person, or any part of the cargo, which, in his/her opinion, may represent a potential hazard to the safety of the aeroplane or its occupants;
So, a person who has proven that they are unwilling to obey the safety commands of the cabin crew has also proven they are a risk for further flight during any problems that may be encountered down route. Lucky you weren't on my flight then ....