Suiing (or threatening to sue) is a form of harrassment. Your intent is to modify their behavior (or get them to do or not do something) and prevent someone else from doing the same thing to you. With our suit crazed society and judges who allow these suits to move forward, it has become the norm. If the person bringing the suit had to outlay in advance a reasonable sum of money (say 20% of what they were asking in damages) to cover court costs and cover the defendants lawyers, you'd see these suits evaporate. If the plaintant also had to pay ALL costs associated with the case IF they lost, then it would be a different world indeed.
As it is, as the defendant in a suit, I'd have to hire a lawyer, usually with some form of retainer. And how does the average joe do it? And "free" legal advice just doesn't cut it.
While I have no problem with "anonymous" allegations, it is up to the law enforcement people to make a reasonable determination as to any threat. Also, the captain has the final say. Whether you have a valid ticket or not, he can have you put off the plane. It is his authority to do so.
When in public, watch what you say or keep your mouth shut. Don't do things that attract attention (and this includes cackling out loud). Remember, some things are best left to the confines of your house.