This is stupid. It's like saying a tree fell in the woods but made no sound. Just because no one was there to hear, doesn't mean it didn't make a sound. If none of us were here doesn't mean reality wouldn't still exist. It's an actuality, not the notion of one.
How do you know that? You're just assuming it.
The same way scientists assume the external world is real and exists outside of our minds. Nobody has ever empirically proved that an external world exists.
Materialism is based on one big assumption.
I'm assuming nothing because there's so much evidence out there by countless people who have heard a tree fall, whether from a distance or up close and personal. People actually cut them down for a living, and they hear the sound.
So, if you take the people out of the equation, based on the known knowledge and evidence that it indeed makes a sound, the conclusion is: it still makes a sound.
Let's take this a step further. People nowhere around, yet a recording device is placed near a tree about to fall down: IT WILL RECORD SOUND.
You have to be the biggest idiot I have come across. Ever. In. My. Life. How stupid can you be?
Stop speaking utter nonsense, it makes you look really really STUPID!