"How do you actually know you're real?"

[FallentoReason]

This is a thing I've been hearing lately and truth be told it's getting obnoxious.

"You can't prove I'm real and you can't prove you're real so you just gotta take it on faith!"

I can't pin down what exactly about it annoys me but it itches at my common sense. It's one of those things I can't rationally debunk because honestly, someone who says that the use of the five available senses is something not to be trusted...might as well believe whatever the fuck they want to believe.

Anybody else have to deal with this shit? And if so, how do you guys deal with it?

paulpablo already mentioned Renee Descartes' famous quote "I think, therefore I am" which basically refutes any argument a silly theist might have on this topic. "I think, therefore I am" demonstrates that you are able to question whether you exist, and the very action of questioning demonstrates that the question came from somewhere, which obviously is yourself. Therefore, you are.