First, let me say that everyone has the right to express his/her opinion and if the person is simpley presenting an alternate view it may be better just to agree to disagree. Possibly send the person a PM to ask that they start a new group with their side being presented. Most people are reasonable and will make concessions if a person approaches them respectfully and privately. I wouldn't take them on publicly as that causes hurt feelings and makes both parties look like a$$es.

If you make this attempt and the person responds negatively and the person is not following EP guidelines, posting stories within an experience, you can flag that story utilizing the buttons provided within each story. When you flag that story it will be removed from view until a member of the EP support team views it for compliance. If it does not meet guidelines the EP staff member sends a warning to the offender and removes the offensive material. If the poster is within EP Guidelines then you have two options: speak with them directly or practice"live and let live" philosophy and ignore it.

Pssst! Meet me behind the bikesheds and I will tell you what I know ;-)

ask them nicely to get lost

Tink, no offense but are you talking about yourself? You sound pretty negative.