Fear of Inadequacy
Jealousy among employees, or a fear of inadequacy, can sometimes cause an attitude problem with the employee that feels threatened, according to the article titled "How to Handle Difficult Behavior in the Workplace" published on the Mediate website. An employee may feel that his skill set is not adequate enough to perform at the same level as his co-workers, and this causes conflict and an attitude problem that can become pervasive. Talk with the troubled employee and ask if they feel they would benefit from further training. See if you can arrange to have the employee train with people within the company, and recommend training material the employee can look into outside of the office.