It hardly needs to be someone who can "make your life really unpleasant". There's no implied threat.
If I were told "We don't do that here" at a new job, I would learn that I stepped across a line and likely a generally agreed-upon line, and that if I continue to do so, I will be causing problems for myself. And I mean "causing problems for myself" in the same way that any other behavioral quirk causes problems, from chewing with your mouth open to yelling at someone for not putting paper in the printer.
But then, I'm also not someone who feels the urge to debate what line was crossed, whether or not my intentions mattered when I crossed the line, the precise location of the line and any others that I might cross in the future, or whatever it is that them as cause this particular issue want out of the conversation.
If I were told "We don't do that here" at a new job, I would learn that I stepped across a line and likely a generally agreed-upon line, and that if I continue to do so, I will be causing problems for myself. And I mean "causing problems for myself" in the same way that any other behavioral quirk causes problems, from chewing with your mouth open to yelling at someone for not putting paper in the printer.
But then, I'm also not someone who feels the urge to debate what line was crossed, whether or not my intentions mattered when I crossed the line, the precise location of the line and any others that I might cross in the future, or whatever it is that them as cause this particular issue want out of the conversation.