In sg, the language we use in a business setting, be it for
verbal, electronic or written, is predominately english. To a
lesser extent mandarin and malay.
Therefore, having a better grasp of english allows us to be more
proficient at our documentation, put ideas across in a more
articulate manner and giving the overall impression of better
better at our tasks than we actually are. Hence many working class
ppl associate being english speaking with being "higher class" in
the same manner school children associate "cool lingo" with the
"cooler" kids.
Of course knowing english is NOT the same as being high status.