On my airplane (or in my business, in my home or in my car), "unruly" is what I say it is. On YOUR airplane "unruly" is what YOU say it is.
Fair enough, but could you at least post some kind of standard of some sort? Some kind of a "you cannot be more than THIS obnoxious" on our airline? Perhaps a short film before boarding, or a comic book primer ala "Goofus and Gallant". Something like that.
That doesn't give you the right to make a citizen's arrest.