In a novel "Dead Beautiful " by Yvonne Woon a guy tells Renée about the lady who punished her:
“Lynch loves watching people squirm. She’s always on me for having too much facial hair.”
I couldn't find what exactly "on me" means, though I could make out the meaning from the complete line. So is it used? And does it mean: "shouting at or criticizing someone "? What exactly does it mean and is it's use common?