What is a noun for a bad/negative role model?

The Opposite of a Role Model

People you don't want to be.

My wife worked as a technology consultant several years ago. She liked the job. She enjoyed the work.

Sort of, at least. One day she quit, abruptly and without much warning.

Nothing bad happened. No client ruined her day. No manager screamed in her face.

She just noticed that her bosses were miserable. They worked too much, rarely saw their kids, and always seemed stressed. They were nice people, but she didn't admire their lives at all.

Then she realized, wait: The career path she was on was specifically designed for her to become those people one day. That was the goal.

How do you stay motivated at a job where you feel bad for the people you're supposed to aspire to become?

ou don't. So you quit.

Nassim Taleb has a great quote. "People focus on role models," he says, "it is more effective to find antimodels — people you don't want to resemble when you grow up."

Reference :http://www.fool.com/investing/general/2014/12/18/the-opposite-of-a-role-model.aspx

Also "bad influence" seems to fit.