Yes, the “good” stereotypes are often bad. Serial killer Ted Bundy lured many of his victims into a sense of security due to his clean-cut looks, ability to seem sincere, and sometimes for showing a false need for assistance due to a fake injury. Even the police overlooked the leads that were called in because of his appearance during the hippie era and the fact that he was a law student.
If you haven’t seen it yet, you might want to watch A Class Divided. It is a documentary about a grade school teacher who conducted an, albeit cruel, experiment on her students on good vs. bad stereotypes. I was happy to see that they did a follow-up session with them once they became adults.