It is also totally true that you are not squeaky clean in your employment (never been late once? Never missed a deadline?), and that your performance management targets are set by the people against whom you are protesting. You can be performance managed out of a position in months, even if your right to protest is protected and you are literally a Saint in the workplace.
I'm not saying it's right, just that I've seen it done. There is always a way to remove "difficult" employees regardless of protection laws.
So, I believe this, but what gives me comfort here is having seen companies try to performance-manage people out (for legit reasons!) and fail because of protected-class problems. As soon as you can credibly allege retaliation, your case gets 100x more expensive to dispose of. In two companies, one of which I had a senior role at at the time, I've seen the companies cave and pay out to make them go away.
It is also totally true that you are not squeaky clean in your employment (never been late once? Never missed a deadline?), and that your performance management targets are set by the people against whom you are protesting. You can be performance managed out of a position in months, even if your right to protest is protected and you are literally a Saint in the workplace.
I'm not saying it's right, just that I've seen it done. There is always a way to remove "difficult" employees regardless of protection laws.