As an HR expert, it is important to address the situation professionally and ethically. It is concerning that the boss and some colleagues are making negative comments about the employee's health condition and reasons for resigning. This kind of behavior is not only unprofessional but also discriminatory. It is crucial to create a respectful and supportive work environment for all employees. In this case, it would be appropriate to remind the boss and colleagues about the importance of respecting privacy and confidentiality when it comes to personal health issues. The employee should not be pressured into working beyond their resignation date, especially if it affects their health. It is recommended to document any inappropriate behavior or comments made by the boss or colleagues and address them through proper HR channels to ensure a fair and respectful workplace for everyone. It is also important to provide support to the resigning employees and ensure they have a smooth transition out of the company.