Our expert says:
Obviously it is your obnoxious colleague who is thoroughly unprofessional and spiteful - and interfering. As purple says at least initially your right to expres milk at work is protected, and you should ask HR to take steps to protect your rights on this issue, and to instruct Mr Nasty to grow up and stop interfering in other people's lives.
Your right to express far exceeds his right to express himself unpleasantly
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