We agree on that, there should be clear and accessible policies defining what behaviours are unacceptable and people shouldn't be fired on the sole basis that someone else thinks they are a jerk.
However, I think it's reasonable to summarize a team's values with be considerate, don't be a jerk, I wouldn't expect Ilona to post a dense HR document defining what it means to be a jerk in their context.
It should the defined.
Team's value. What is that?.
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