It's not grounds for being fired because there are no grounds for being fired. You can be fired for depositing your first paycheck in a bank that starts with th

It's not grounds for being fired because there are no grounds for being fired. You can be fired for depositing your first paycheck in a bank that starts with the letter A, if your boss wants. There is a specific set of things for which you cannot be legally fired - "wrongful terminations" - because terminations are by default rightful. And there are a specific set of things for which you effectively must be fired if the organization doesn't want to be seen as approving of your behavior, which is what the abusive workplace stuff is about. Note that the links you provide are about laws that apply to companies, not to individuals. Between those two extremes, there's a whole lot of stuff for which you can be fired. Reflecting badly on the company and making their customers unhappy, while breaking no laws and exposing the company to no legal risk, is an extremely common case. It is pretty unfair that people lose their livelihoods because of their employers' whims, and it happens to a whole lot of people who have not even done anything worth apologizing for, and I think our society needs to address this problem in general.