What does ''your intelligence is pulp'' mean in the sentence below from the movie ''Sophie's Choice''

I suddenly remembered that my father is waiting for that speech,and I hurry home to finish the typing, but in my rushing and my haste to finish that, I make so many mistakes in the sentences. And I run with it to the university, and my father has no time to check that before speaking. And he get up in front of all those people, and he reads the speech and make those mistakes and I see him getting so angry. And when it was over, he came up to me. I was with my husband, of course. And in front of him and all his colleagues he said, "Zosia, your intelligence is pulp." Pulp. I did not have any courage to say, "Yes, but what about the Jews?" The Jewish people, but... After that, he didn't trust me anyway. And neither did my husband.