You have a legitimate cause. I got reported for much less than that, and I never cursed anyone, made rude texts, or threatened to stab someone.

It's good that you stood up to him. Keep in mind that he could potentially be violent (which you probably already know), and keep your encounters with him as civil as possible. Don't stoop to his level. What you did was entirely justified, though.

Depending on how your workplace handles things like this, though, it might not be enough to report it. Unfortunately, some workplaces aren't very supportive of their employees. If your workplace is one of those, you should probably seek other options, at least as a back-up plan.

If this man is the only one causing trouble, though, maybe ask some of your other coworkers if they have had trouble with him. If they have, they might want to lodge their complaints as well.