an ‧ tag ‧ o ‧ nize BrE AmE ( also antagonise British English ) /ænˈtæɡənaɪz/ verb [transitive]
[ Date: 1600-1700 ; Language: Greek ; Origin: antagonizesthai , from anti- ( ⇨ ↑ anti- ) + agonizesthai 'to fight' (from agon ; , ↑ agony ) ]
to annoy someone very much by doing something that they do not like:
Do not antagonize your customers.