It would be very easy to disprove empirically: if I threw a baseball
at you, and you didn't duck and weren't bruised, I might be willing
to believe that your reality didn't include my baseball; if you and
I set up cameras with timers to record an eclipse, and we get different
photos, then I might believe our moons were different. But experiments
like this have been performed every day for thousands of years, and I
have yet to see personally or see a credible report of one failing.
One cannot empirically prove the absence of a phenomenon, like
subjective reality. But one can easily prove existence, and therefore
disprove non-existence. Since this has not been done, I am willing
to commit my life to objective reality until it is, because I've seen
that those who do so produce more value and commit less evil than
those who do not.