You sound like you have an immense chip on your shoulder over this incident.

All kids would likely benefit from a better form of teaching than the conventional school methods. However if you get a classroom of gifted children and you add a non-gifted child, the non-gifted child likely won’t be able to keep up at the same pace. There’s something to be said about segregating children with similar learning abilities so that the pace of the classes are at good levels for everyone in the class.