Her description seems unkind.
But why is she obliged to be kind? Why is she expected to indulge, to play along? She is not said individual’s mummy & she should not have to endure a game of “pretend” that has been foisted upon her without her consent. Given the way the individual in question grabbed her, Greer could easily have reflexively clocked them, not just pointed out - in an article long after the fact - that they were unmistakably not of the female sex; that they could not become female; & that their behaviour as much as their appearance betrayed them as male.
Why should Greer lie about any, let alone all, of those things? And why is it considered kind to pretend it is possible for humans to change sex? It is a truly dreadful lie to tell; almost made worse because [so many of] those who want to believe it are incredibly vulnerable.