Had the HR deparment said something like We became aware that you dislike one of our clients, and that you have strong beliefs that we shouldn't do business wi

Had the HR deparment said something like We became aware that you dislike one of our clients, and that you have strong beliefs that we shouldn't do business with them. Given that, we decided that you should not work with us because you think we shouldn't do business the way we do. what would have happened? Could this clear and direct justification still be used as basis for a lawsuit from the employee?