an·tag·o·nize 
(ăn-tăgə-nīz′)
(ăn-tăgə-nīz′)tr.v. an·tag·o·nized, an·tag·o·niz·ing, an·tag·o·niz·es
1. To incur the dislike of; provoke hostility or enmity in: antagonized her officemates with her rude behavior.
2. To counteract.
[Greek antagōnizesthai, to struggle against : anti-, anti- + agōnizesthai, to struggle (from agōn, contest; see AGONY).]