I suggest that you write a polite and brief rebuttal to your evaluation. The trouble is, if you are an "at will" employee it doesn't matter how long you've worked there; walk on eggshells as though you've been there two weeks, especially with a new manager.
Keep records. In fact, you may want to keep a work journal at home. Just be aware that should you ever have to go to court, the opposing side has the right to read your journal.
And, again, if you're "at will" the employer can fire you at any time, for no reason at all. Given that, if the employer fails to give you a review, provide a gentle reminder in writing, and never speak of it again.
If the employer IS discriminating against you, they'll say they're not discriminating, and that it was a behaviorial or performance problem. Don't give them that excuse.
Thanks for paying promptly,
Jane Doe Deer