Job cut my hours to one day or none all because I told them I wouldn't be harassed anymore by a particular coworker.

I currently work as a line cook at olive garden on Busch blvd in Tampa, fl. A few weeks ago I got into an argument with a coworker because I no longer allow him to harass me. Well ever since then after I went to my manager about it, they have cut my hours down to one day a week or not at all. I've tried talking to my manager about this with his boss and instead of doing anything they hired two more people. I need this job. I love my job and I am one of the best they have. But because the person I argued with has been there for 10yrs or so and I've been there for one year they chose him in my opinion saying I have an attitude. I'm a cook. I get along with everyone there I did my job, stayed late, did extra. And now my manager just didnt put me on the schedule at all.