I had that problem of getting along in public for a few years when i was off meds and really poor. I argued with everyone. I couldn't take a bus ride without arguing with the bus driver. It was miserable.

After i got back on meds and on disability benefits it slowly went away and now i am an angel -- cooperative, polite, patient. I'm assertive where appropriate but it's rarely required.

Not to discourage you, but it took about a year for the belligerent behavior to subside. Give it time.