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nothing is real do what you want
That is a fallacious conclusion from this observation. Don't use this philosophy as an excuse to act like an asshole.
While everyone perceives reality slightly differently, apples do have a specific light absorption and reflection spectrum.
Our limited perception of it doesn't make it "not real". Same is true for other senses as well.
There's also the possibility of Boltzmann brain hallucinating things, but since there is no way to prove or disprove it, that's still not a reason to be an asshole
In fact, if I am a brain in a vat hallucinating the world, then all the people I interact with are just aspects of myself.
So if I'm an asshole to other people, really, I'm an asshole to me.
Just a fun tidbit: The guy who proposed the math for the many worlds hypothesis, Hugh Everett, was reportedly a huge asshole (and abused his own health) because he figured that in a lot of other versions he was a swell guy.
Thank you.
But you're not real!
Descartes proved to me that I was!
In the assumption that you are real, because you think and therefor you must exist in some form, but have limited control of your perceived reality through your actions, you should make choices that maximize your satisfaction but your longterm satisfaction is actually dependent on not being an asshole.
Therefor, our lack of provable existence does not factor into whether you should or should not be an asshole.