Well, AM didn't really care about protocol, at least not at this moment. He could blend in well enough when he could, having witnessed decades of humans in their most sensitive moments.

However, he did know that humans apparently toasted wine to mundane things when they drank. It was rather silly, but he felt like being a dick tonight.

"You know, you're supposed to make a toast before you drink the wine."

How's that for protocol? He probably figured HAL didn't even know what a toast was, aside from toasting bread.