Did you hire a plumber to fix a leak in the kitchen? I am a plumber. Are you trying to rub my face in it? Don't you think I am skilled enough to fix it?
 rub one's face in something rub something in one's faceRub one's face in something 可指重提某人丟臉的舊事，再度強調丟臉的地方，也可指強調某人現在丟臉的地方