Not everything bad is terrorism. A mentally ill person going on a murder-suicide rampage after beijg ignored by a girl is not a terrorist. A person acting in their self-interest in a way that contributes to systemic racism or oppression is not a terrorist. Hunting or threatening people of a certain race or gender or orientation or hobby to scare them and others away is terrorism. Blowing up buildings to pressure decision makers into a policy change is terrorism.
Maybe manipulating a single individual via threats or minor violence could be considered small scale terrorism (but their are better words, like harassment or abuse or stalking or assault).