Why does Holden become angry with Mr. Spence?

Holden hates being lectured by Mr. Spence.Holden tells Mr. Spencer that his parents will be upset, for this is his fourth private school so far. Holden recounts that, at sixteen, he is over six feet tall and has some gray hair, but still acts like a child, as others often tell him. Spencer says that he met with Holden’s parents, who are “grand” people, but Holden dismisses that word as “phony.”