What city state and country were you drinking? Are you aware of the Liqour laws where you were drinking? They limit the amount of drinks served.

Were you loud or making a scene? Could someone have thought you were drunk even though you were not drunk?

It’s the Centurion Lounge but local laws apply. Every USA State has laws limiting how liqour is sold and consumed ON PREMISE (key and important words) and the establishment must follow the laws or risk losing their valuable liqour license.
Responsible establishments would rather error on the safer side of refusing or limiting service.