A Scene in Singapore?

I was at a bus-stop waiting for a bus.

I saw an old man walked to the dust-bin. He looked into it and picked up a plastic bottle still filled with drink. To my dismay, he opened up the bottle and drank it. Then he continued digging in the bin and found a metal can. He stepped on the can and put the flat can into his pocket. He searched and found an unfinished cigarette butt. He got a light from a smoker and enjoyed a few puffs before the butt was finished.

I am confused.