Social tension right before my eyes

I saw it last evening in the train. The apparent peaceful atmosphere was deceiving. There was this local sitting there with eyes closed and beside him was a FT. I did not see what actually caused the outburst, but probably a brush while sitting tightly beside one another.

'I know you are not Singaporean. Go back to your country.' The FT was stunned. And all was silent.

Later the FT stood up to