I wouldn't say definitively that every mushroom is safe to chew and spit out. There could be some toxins you'd absorb through the membranes of the mouth. I don't know of any but there are a lot of species of fungus. Maybe fire coral mushroom?

There is also Gyromitra which can be rendered mostly edible by boiling... however, the toxin is volatile and can be inhaled by the cook causing poisoning through a fairly unique mechanism.

I mean you eat it, it kills you, then the spores grow out of your dead corpse. Seems like the fungus still wins.

Also mushrooms: you look at me and your liver is ded.

But doesn't that make poisonous plants much easier to spot? Isn't the apparent safety what makes poisonous mushrooms so dangerous?

Yeah but what about venomous mushrooms

Perfect example:

https://www.youtube.com/shorts/7yuNp5YBY1Q

Chewing death caps does not sound safe.