Looks like I'm about to be terminated and the way the company is going about it looks like discrimination.. First was a weird memo.

North Carolina is an employment-at-will state where an employee can be fired at any time for any reason. If discrimination motivates a termination, it is unlawful only if the basis is; race, color, sex, national origin, religion, disabiliyt or age 40 or older.  There is no legal requirement that you agree with a performance review.  You can refuse to sign the review, but they may tell you to sign or you will be fired which is lawful.  I generally recommend that employees do not sign employer documents that contain false information unless the form indicates you are not agreeing with the contents or they add language like "I do not agree" with their signature.