This may be more of an enhancement request that a question.. but is there a was to exclude users from a Group Policy which is assigned at an OU level?

I currently have a different Group Policy to change settings for people with a disability. This is assigned directly to the desired users, however it appears that the policy assigned to their OU is also being enforced, and seems to be taking precedence. (is this behavior normal??)

(ZCM 10.2.2 - Windows XP Pro SP3)