Why does the enzyme trypsin get deactivated when introduced in the gastric juice of the stomach?

In my Biology Honors Class, they taught about gastric juice, or also known as    (p H) which is formed by stomach glands, is very acidic and can seriously mess up enzyme trypsin functions. After all, enzymes are a type of catalyst that help break down food, which means that enzymes are a sort of digestive acid as well. Hope this helps!