Discriminate against... a personality that will negatively impact the team dynamics? It's not that easy, to be honest, as every team has its own requirements.
would you be able to document this negative fit in an impartial way when rejecting a protected class?
A stereotypical Asian interviewing a stereotypical German might find the German rude in some interactions. While another German interviewer would find it being frank.
Interviews based on personal feelings have hidden biases not even the interviewer is aware of.