I am surprised how the conversation has gone. Just to clear things up. I am not Asian. I am fully Anglo Saxon, Australian.The security guard who stopped me could speak decent enough english. Maybe I was purely unlucky.
I just wondered when he asked me for my baggage tags/ proof of boarding pass for that days flight only for him to reject me I was like... (Why did you even ask for it then?)
Thinking back on it he probably thought most people threw away their boarding passes upon arriving at the airport. He probably wanted to use that I had no proof as a reason. Still was denied entry.