There you go relying on that philosophy your rejected again!
Actually we can be more certain of self existence and inner experience, for everything else is filtered through it. I know that "I exist" is a true statement, and there's no possible way I could deny it or be incorrect. Yet this doesn't mean I can show you my inner experiences in some physical way, they inherently seem to be personal, immaterial, non-spacial, etc and so on. Now sure we have evidence to believe in a physical world, but even then we're moving away from a default position, as we can never know or access this world without obviously existent inner experience. But even if we accept that this world exists despite our lack of certainty - for it certainly seems to exist, it's still then on the physicalist to show that only that physical matter is real, and what we directly and axiomatically seem certain of reduces to it. So in no way you can slice it is physicalism a default position.
Lol. If you can't win a philosophical debate, become a solipsist. You should have done this back on Page 1 and saved everyone this circle jerk.