Being a liberal is a protected class if some judge wants it to be. But always remember, it is often not necessary to have a winning argument in civil litigation. They key is how much Hell you can put the other side through in the process.
And if your liberal employee has the wits to file a complaint pro se, you'll find the judge will bend over backwards to give him leeway, since he is not bound by the lawyers' code of conduct.
Ask me about the time that I was a defendant in a $45 million lawsuit, and acted to defend myself pro se. I put the plaintiffs through so much Hell that they finally agreed to settle with me for $1,200. And they soon after dropped the suit against the other defendants.
It took two years, but I finally got to them. I had a great time writing pleadings just to run up expenses on the other side.
I have never lost a case against a pro se party. I cannot recall one getting past a motion to dismiss. I’ve even popped a few of these wannabes for fees and costs-one of these wise guys went bankrupt.
As for protected classes, those are set by statute. Federal judges generally do not like to “read in” other groups of people. Now, if there is something in the ACA about retaliation against people or other legal remedy, then that is an entirely different animal.