Subject: Warning for Disrespectful Behavior
It has come to our notice that you resorted to unprofessional and rude behaviour in the workplace on [DATE].
We would like to inform you that this behavior is unacceptable as per our company policy. Further, this behaviour is also considered as misconduct on your part which is a violation of our ethical code of conduct.
Your Manager has already discussed with you verbally on this matter. We are sending this official written warning to you. If we see any other instance of disrespectful behaviour in future, you will be subject to disciplinary action as per company policy.
We recommend you to treat this matter with utmost importance and seriousness. You are advised to change your behaviour at the earliest. Note that a copy of this letter is attached in your employment record.
Let me know if you have any questions.