Exclude Disabled users from People picker

https://sharepoint.stackexchange.com/questions/125977/why-do-i-still-see-a-useraccount-in-the-people-picker-but-this-user-account-is

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http://www.sharepointdiary.com/2011/09/sharepoint-people-picker-shows-deleted-users.html

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http://www.sharepointdiary.com/2012/04/delete-users-clean-up-user-information-list.html

You can delete users individually from  the hidden list
http://rfportal/_catalogs/users/simple.aspx


Bulk remove, my solution
https://www.sharepointrelated.com/2012/10/11/remove-users-from-user-information-list/

https://www.qdoscc.com/blog/sharepoint-tips-remove-disabled-user-profiles-search#comment-142