As a consequence, they "feel" that they are indirectly eating rotten animals/plants while consuming mushrooms and thus "projecting" an image of it being a non-vegetarian food item. One fellow quoran said that the slaughter house wastes are used to grow mushrooms. read more
Mushrooms are a fungi and considered more often for their protein. They often serve as a meat substitute in vegetarian dishes. Often times they are grouped as a vegetable simply because they grow out in the world and do not come from an animal. read more