Bigotry is usually the backlash of ignorance and insecurity (fear). A bit like a toddler lashing out when they don't understand or are upset.
The trouble lies with the adults and those with power (parents, teachers, clerics etc) who encourage action.
Maybe it gives them some sort os vicarious thrill to see the results of their words on the people they can manage to make into their puppets.
All bigotry needs to be tackled with education but it is difficult to overcome prejudices digested with mothers milk.