can be a bit of friendly banter, like calling a Scotchman [

For some reason the lifts down to the MRT seemed to be a hotspot for people making derogatory comments about me in Chinese behind my back. For a while my SGn (but non SGn-looking) wife would translate these for me and I was genuinely shocked at the bile in some complete strangers.
Pretty soon I got to recognise when someone was 'having a pop' at my expense. So I got my wife to teach me a few short but truly gutter phrases in Mandarin, to turn around and say right to their faces in front of everyone in the lifts.
The looks of complete stunned horror on their faces, made all my anger simply disappear.
Justice done.