Adult bullying is when someone destroys your peace in private, your reputation in public, and your relationships behind your back then calls you the problem when you finally speak up.
They provoke you until you react, document your reaction while ignoring their behavior, and use your response as evidence against you.
That is not maturity. That is manipulation.
Some people have grown in age, money, and social status but have never developed the emotional maturity to treat another human being with basic dignity.
Never mistake a well-respected public image for a good private character. The two are not always the same.