I’m a trans woman. Two things can be true here:
1. Adichie is transphobic.
2. Whatever the harms of her transphobia, the other person referenced in this post behaved egregiously outside of professional and personal norms in attacking Adichie, and this behavior is not appropriate in any circumstance.
Too often I think people complain about how they are treated on social media, or about “ideological orthodoxy,” as a proxy for defending opinions that they understand to be offensive. But it’s perfectly reasonable to think both that Adichie’s opinions on trans people are offensive, and that the offense does not justify the aggression she received here.