Hello,
I'm a Scrum Master on a a team that has been together for almost a year. We just added some new team members to the team. One of the original team members took notes (not agreed upon by the team) from the Retrospective and send out questions to the group, upper management and our agile coach without getting the team's permission thus breaking the Retrospective trust within the old members and creating conflict.
When I have attempted in the past to remind this team member of agile practices in the past they become defensive and hostile.