Generally plants are considered as vegetarian diet whereas animals as non-vegetarian diet for humans.
We inhale or intake bacteria and fungi (or fungal spores) in several ways like via food, water, air etc. These days bacteria comes in market as probiotics (a good bacteria). Then, what type of diet we call to bacteria and fungi - vegetarian or non-vegetarian, and why?
If someone considered fungi and bacteria to be included in a vegetarian lifestyle, they would starve to death. You swallow bacteria that live in your mouth all day. Every uncooked food you eat has a layer of bacteria and other microorganisms covering it no matter how much you wash it. If you cook food, then you kill all the microorganisms in the process. Would a microorganism-concerned vegetarian consider killing these organisms better than eating them? If you want to use taxonomy, at the Kingdom level Animalia, Plantae, Fungi, Protista, Archaea, and Bacteria are all separate. One would assume a modern vegetarian eats everything except Animalia. But still there are microscopic members of Animalia that are likely eaten by vegetarians frequently. So perhaps the best description of a vegetarian is someone who eats things from every Kingdom of life except macroscopic Animalia.
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