Which seems more damaging in an [unlawful discrimination](http://www.eeoc.gov/) case:
“Thank you for coming to interview with us. Unfortunately we decided to hire another candidate.”
or
“You had trouble connecting with the interviewer. We call that “culture fit” and value it tremendously. We encourage you to practice your interviewing skills, so you can fully take advantage of your superior technical abilities.”
The discrimination fear is a boogeyman. The example you gave isn't risky at all. The risk is that one time someone will actually leak a illegal behavior.
Which seems more damaging in an [unlawful discrimination](http://www.eeoc.gov/) case:
“Thank you for coming to interview with us. Unfortunately we decided to hire another candidate.”
or
“You had trouble connecting with the interviewer. We call that “culture fit” and value it tremendously. We encourage you to practice your interviewing skills, so you can fully take advantage of your superior technical abilities.”