In your worldview. It is actually unknown one way or another as least so far in recorded history.
No, not "in my worldview" - by the rules of logical argumentation and rational rigor that we both have implicitly agreed upon for the duration of this discussion. If you think you have a stronger case than me, you need to be able to argue this within the boundaries of those rules.
Of course, outside those rules, the gloves are off - and outside those rules, I can just tell you that you're wrong and believe it, and there is nothing you can do to change that, and since per your own understanding you're only a figment of my own imagination with no intrinsic qualities, that's all I ever need to do.
EDIT: Cognitive solipsism is ultimately self defeating, because everyone can do it, but there is only one subjectively real person in
my subjective world, and it isn't you.