That's a common mistake. Words have meanings:Your definition of "activist" is anyone who doesn't agree with your point of view.
Judicial activism describes judicial rulings suspected of being based on personal or political considerations rather than on existing law. It is sometimes used as an antonym of judicial restraint.
judicial activism - an interpretation of the U.S. constitution holding that the spirit of the times and the needs of the nation can legitimately influence judicial decisions (particularly decisions of the Supreme Court)
Liberals are currently engaged in a concerted effort to redefine judicial activism. Rather than accepting the true definition of judicial activism—when a judge applies his or her own policy preferences to uphold a statute or other government action which is clearly forbidden by the Constitution—liberals now apply the term anytime a statute is struck down or when a court delivers an unfavorable decision.
What is Judicial Activism?
Judicial activism occurs when judges write subjective policy preferences into the law rather than apply the law impartially according to its original meaning.
There are nine types of Judicial Activism:
Importing Foreign Law