If extreme Promotion is Advocacy what do you call an extreme Detractor .. a Protestor ? a Militant ?

If extreme Promotion is Advocacy what do you call an extreme Detractor .. a Protestor ? a Militant ?

We have been working with a client that has been measuring customer satisfaction and relationship perceptions for 8 years. They recognize that NPS as a “score’ does not really help with driving specific actions but it is highly informative and most importantly...