It was Newton that originally named ROYGBIV. Historically the word "blue" would have referred to a cyan colour, and "indigo" to a deep blue. So in fact you and

It was Newton that originally named ROYGBIV. Historically the word "blue" would have referred to a cyan colour, and "indigo" to a deep blue. So in fact you and Newton agree with each other, and the apparent difference is just due to semantic drift.