Why was Husserl accused of radical subjectivism?

Edmund Husserl was accused of radical subjectivism primarily because of his contention that the transcendental ego—the thinking subject—"constitutes" objects.1

This accusation arose from his methodological requirement to perform the phenomenological reduction, or epoche, which involves "bracketing" the existence of the natural world. By setting aside the assumption that the world exists independently of consciousness, Husserl focused exclusively on the "sphere of immanence," where everything is treated as a meaning or an object intended by pure consciousness.213

Critics argued that because this transcendental subject exists outside the world whose existence it suspends, Husserl’s philosophy effectively reproduced a form of dualism and reduced reality to nothing more than a mental construct. Although Husserl insisted this was a purely methodological approach to understanding how meaning is formed, the resulting framework—which he eventually termed transcendental idealism—led many to conclude that he had abandoned an objective reality in favor of a subjective, mind-centered system.31