Make a list of all the things that exist.
Most of them you can put into some type of category with other things.
Helium and oxygen for example. Liebniz and Newton. Dolphins and humans.
Most things fit into objective reality. They have measurable magnitudes like position and energy.
The subjective experience doesn't fit into that category.
It doesn't fit into any category.
Because "subjective experience" is a nonsense phrase.