Opt out of email notification to all users in a role

np,
Create a field called [Current User] with a formula of 

User()

Make a copy of the report with he name suffixed with (subscription version)

add a filter to the report

 [Current user] is not equal to (type in the email address on the user to block.)

Change your subscription to use the "Subscription version" of the report.

Y'er done.