Assertive is not aggressive!
It is a common misunderstanding that assertive behaviour is aggressive.
To avoid this we use a simple definition.
Aggression; where one person only has an interest in their own point of view
Assertion; where a person expresses a balanced explanation of both points of view, whilst still expressing their own point of view.
When we’re assertive we do put our own point of view but we also recognise other points of view at the same time.