When we mentioned hardcore to describe a person, that particular person is an intractable core or nucleus of a society, especially one that is stubbornly resistant to improvement or change. Hardcore personalities are hostile, abusive and intimidating. They always have to be right and will charge like angry bulls if you are challenge or cross them. When these people exist at workplace, it is always come with discipline and performance problem. Hardcore employees always think they are right, they are resisting changing.