This article explains how to hide specific Facebook posts from specific people using the Privacy drop-down menu. It also includes information on how to share a post with just a handful of specific friends.
How to Hide Posts from Friends on Facebook
Every time you share a post on Facebook, you have the option to share it with the public, with just your friends, or with a smaller group of people. If you don’t change the setting each time, it will default to the setting you last used.
Here's how to exclude a specific person (or people) from your Facebook post.
Select the What's on your mind field to open the Create Message window.