I've long thought that 'culture fit' as feedback to a rejected candidate is an incredibly murky area. One that should be avoided and has no real substantive grounds. Now as the importance of inclusion in the workplace gains more pace it's vital we stop this practice and look at how a more diverse culture will positively enhance an organisation. There's no denying that culture is important to an organisation. However by hiring those that would not traditionally fit into your cultural 'box' you stand a good chance of enhancing your culture for the better and creating a more inclusive workplace.
This article shares some examples of how the likes of Facebook are dealing with this issue.
In some organizations “culture fit” has become a weaponized phrase that interviewers use as a blanket term to reject candidates that don’t match the hiring manager’s view of the ideal candidate; and as such, it has become the embodiment of unconscious bias. Most interviewers are more likely to hire people like themselves and discount those who are different. This type of thinking hinders diversity and leads to homogenous cultures.