Yeah, this doesn't sound like the Front Desk actually called you. I'll bet it was the drunk woman.

Why didn't you throw a fit at checkout? That's what I would've done. There would be an MOD who could have responded and investigated. Sounds as if you got a ridiculous form letter from the GM. Pathetic. Rat him out to corporate.

Honestly, this is a safety/security issue, and the hotel should be extremely concerned. I'm glad you named them--I always think that's appropriate in a case like this.