No one 'has' to fly. It's a choice you make. Most people don't want to get booted off the flight, but usually they get the volunteers. They didn't this time . Someone got told they are the unlucky one. FGS, just get up and leave. Run your mouth, have an attitude, but get up and walk away. He chose the 'I'll sue your *advertiser censored* off, you can drag me' method, his bad call. they did it.
If it goes to trial, and I'm on the jury, he wouldn't be receiving a big payday. But, I know the airline will probably just settle with him, and that's their choice, but there is a lot of people that think like me and you don't need but one of us on the jury.
I also know a lot of you agree and say that you would have done the same as he. Not me, I would have walked off. Maybe tried to file some type of complaint, get on the news as a disgruntled customer, what ever. But I definitely wouldn't have ended up with a beat-down over it.
JMO