Singapore Immigration review: bad attitude of officer

my bad experience from custom on 15/01/19. The officer from counter 18 (duty on 15/01/19 6am) has bad attitude plus low efficiency in work. As compare to the next counter, he works slower (when he clear 1 car, the next counter have already cleared 7 cars). The worst thing is his bad attitude towards non-Singaporean. When checking the passport, he didn't called for every passenger's name as what usually other officer will do. He showed us his [censored] face like we owe him and also shout at us " foreign worker! Foreign worker!' which really make me feel insulting! Your attitude is like a price tag. It shows how valuable you are!