I think that one way a manager's role is important in removing stereotypes is to lead by example. This goes back to the idea that there is complete immersion in the role of management. The manager should see themselves as a professional and personal example to those who must work under them. This is a traditionalist view, one that suggests that the personal and professional conduct of a manager is vitally important to the success of the company and its workers. This is a bit radical because most managers are not necessarily seen as "role models," but this conception of how managers can play a role in dispelling stereotypes is rooted in it. Managers must embody the type of thinking and action that does not facilitate stereotypes and speak out against behavior in the company that does this. This means that managers have to be mindful of how company policies and practices are perceived and ensure that employees can see the manager as representative of being able to speak out against such practices. I think that this is where one can see where managers have a role and can play a successful role in dispelling stereotypes. There is a point that workers can point to management as an example of how to behave and how to appropriate the world in accordance to its own subjectivity. This paradigm is where management can play a role in dispelling stereotypes.
I have a neighbor who worked or twenty-seven years for a Fortune 500 company. For much of that time he worked as a service supervisor, who hired service representatives. Before he could interview or even see what the candidate looked like, his secretary administered a test, which measured logic, math, mechanical, and electronics skills. To be considered as a candidate for employment the potential service representative had to score at least a 95% on the test.
I read about a similar test, which IBM has used to select employees. What becomes of the Broken Hearted by E Lynn Harris tells about how Harris took the IBM test and passed it with high marks. Harris was black and very likely would not have gotten an interview except for the fact that he passed the test.
My neighbor reports having similar experiences with people he hired. Many of the them would not have gotten an interview if he had seen them before they took the test.
The answer to the question might be that people will always react to stereotypes, but having object measure helps to get beyound them.