One of your co-workers gets there job done but has pore relationships with other co workers?

One of your co-workers gets there job done but has a pore relationship with other co-workers what are your thoughts about this employee (this is for my mommy)One of your co-workers gets there job done but has pore relationships with other co workers?
The number one reason why employees leave a job (voluntary or not) is the inability to get along with others or to be a team player. Furthermore, if an employee is causing problems on the job, it hurts the overall productivity of the work unit and costs the employer money and good relations with his customers.