Seriously fella, I'd just let it go and get on with your life. Put it down to experience...
In over over 150 sectors commuting to AMS & occasionally ABZ, I've only ever seen one person off-loaded by a Captain (with 2 burly baggage handlers lurking about...!) and that was for some seriously obnoxious behaviour towards the lone cabin crew on an EMB145, so I'm quite convinced that something precipitated this situation and you may just be prolonging your misery by pursuing this in the courts as the airline was well within their rights to eject you.
Same as a pub landlord can basically refuse you entry to his premises for whatever reason he wishes.