Final answer:
Miss Ivors is angry with Gabriel because he doesn't speak Irish, which is important to her.
Step-by-step explanation:
Miss Ivors is angry with Gabriel because he doesn't speak Irish, which is a language she values. In the story, 'The Dead' by James Joyce, Miss Ivors criticizes Gabriel for his lack of language skills and accuses him of being a West Briton who looks down on his own country and culture. She feels that Gabriel, as an Irishman, should be more connected to his heritage and language.
The complaint Miss Ivors has with Gabriel is that he doesn't speak Irish. She is angry with him because she considers this a form of betrayal to their heritage and country. Miss Ivors is a fervent nationalist and believes in the importance of preserving the Irish language, which Gabriel seemingly neglects by not speaking it.