Hari Om,
Eckhart Tolle says that if you observe the pain or irritation or discomfort or disturbance or insult,, impersonaly, it will soon disappear.
Ramana Maharshi would ask, enquire, To whom is this bulling occuring.? To whom is this disturbance happening.? etc etc.
Watching the phenomenon with alertness and dispassion and patience, the problem will disappear.
Do not retaliate. But at the same time do not budge or give in. Mahatma Gandhi showed us the path of active civil disobedience. Keep asking them 'Why?' whenever they bully you and they will soon have no answer.
Martin Luther King once said, "Christ showed me the way, but Gandhi showed me the Method."