I have a Remote JIRA Directory (Type "Atlassian Crowd"). JIRA is in version 6.1.7.
Users which are disabled in JIRA still appear in the People Directory in Confluence. Also, these disabled users appear in the suggestion list when typing @ (in page edit mode) to mention a user on a page.
We have a very long list of disabled users in JIRA and the fact that they appear in Confluence is very confusing and a critical issue for us.