Why did Holden get mad at Luce for calling his(Lucas) old girlfriend the 'Whore of New Hampshire?"

When Carl arrives, he asks Holden when he is going to grow up, and is not amused by Holden's jokes. Carl is annoyed that he is having a "typical Caulfield conversation" about sex. Carl admits that he is seeing an older woman in the Village who is a sculptress from China. Holden asks questions that are too personal about Carl's sex life with his girlfriend until Carl insists that he drop the subject. Carl reminds him that the last time he saw Holden he told him to go see his father, a psychiatrist. Feeling humiliated, Holden insults Carl's girlfriend.

you guys really need to do your homework