Direct object
Predicate adjective
Direct Object
Direct object
predicate adjective
predicate nominatives
Direct object
predicate adjectives
objective complement
obj. complement
Predicate adjective
Direct object
Direct Object
Predicate adjective
Direct object
predicate adjective
predicate nominative
The complement "upset" in this sentence is functioning as a subject complement. It describes the state or condition of the subject, Sidney, after the action in the question (teasing) was performed by the subject (you).