Well, he makes a few good points.

First, they could lose their liquor license for continuing to serve a visibly intoxicated person alcohol.

Second, contracts entered into under the influence of intoxicants can be deemed void and non-binding.

Third, and most importantly, they charged him TWENTY THOUSAND DOLLARS. He wasn't gambling, he wasn't getting a reverse gangbang, he certainly wasn't buying a new car. That is fraud and possibly extortion. I could see someone racking up a couple grand in "lap dances" and overpriced champagne because they are stupid and stay there for 12 hours, but even if he was buying lap dances and drinks for everyone in the room no way does he owe twenty grand. There's a difference between a "clip joint" that demands a few hundred bucks and mobsters who try to take everything you own. They went too far in this case.