You might be:
Popular with people.
The bully fears exposure of their inadequacy and incompetence, your presence, popularity and competence unknowingly and unwittingly fuel that fear.
The person to whom people come to for advice, getting more attention than the bully.
Seen as a well-defined set of values which you will not compromise.
Seen as having a sense of integrity.
Seen as having at least one vulnerability that can be exploited.
Jealousy and envy are strong motivators of bullying.
Giving unwarranted or invalid criticisms.
Overruling, ignoring and isolating a person.
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They regularly choose the target by offensive remarks and language or give the silent treatment.
They single out and unfairly treat a person differently to other peers.
They Degrade, threaten, or humiliate.
They encourage you to feel guilty and to believe you are always the one at fault.