It is important to address this situation professionally. First, you should discuss the matter with the person responsible for the behaviour. Give them the opportunity to describe their behavior, as well as to receive feedback from those who are around them. Set clear expectations about the conduct expected in future and make sure that all parties are aware of them.
If you want to follow up on the behavior change, it is important to keep a written record. This includes dates, times and witnesses. If corrective actions do not work, it could be necessary to take a formal disciplinary action such as termination or suspension of employment.
In any case, it is essential that those in charge of addressing this type of situation remain professional throughout – even when dealing with difficult situations or people who do not respond positively right away. It will ensure that all parties are treated with respect and, ultimately, lead to lasting solutions instead of short-term fixes.