"There is no absolute Space and Time".
I don't wish to offend, but the latter statement is just as unfounded and contrary to the entirety of human experience as your recent suggestion that people experience "mass hallucinations". In other words, without property qualification it is also ridiculous.
As for the former statement, it simply doesn't follow logically that there are as many universes as there are individual points of view.
In my world, which is OUR world, there is a singular shared objective environment, to go with a multiplicity of subject povs. These are entirely different things.
There's my one and only comment, PB.