La musique: White devil- Alexisonfire

So all last week my supervisor kept telling me she was disapointed in me, only she wouldn't tell me why. She'd only say it was something non-work related, then reinterate how disapointed she was. On Saturday the same (drunk) supervisor told me it was because of my "excessive" drug consumption. Not that I'm contesting the "excessive"ness, I'm just curious a) Who would have told her, and b) Why it matters to her. I mean, sure I come to work stoned, but she doesn't know that.
It seems that everywhere I work there is not only a healthy rumor mill, but usually it revolves around me.