Everybody understands that a person on a bike is in a very vulnerable situation. 99% of drivers respond to that by being considerate, while the remaining 1% take advantage of that power differential to bully their neighbours.

I don't have a silver bullet solution, but there are many things we could do to help. Personally, I would start by providing a better cycling experience around schools, which can be done with inexpensive traffic calming measures such as in-street crosswalk signs, raised crosswalks, etc. Traffic calming protects all children, including those who walk and bike to school, and people who grow up riding bicycles are going to be more considerate to cyclists when they drive a car.