I would describe myself as a skeptic, and I would be quick to say that the problem of other minds is a load of nonsense. It takes about 3 seconds of critical thinking and any rational person should see it for the crap it is. And no, the norm is not arbitrary in any way.
Metaphysical philosophy is, by and large, stupid and pretentious tripe parroted by people who feel the need to come off as smarter than others.
I would argue that metaphysics is a pointless exercise without first solving epistemology.
At their heart, issues of skepticism are epistemological, not metaphysical. And if you're willing to ask how or whether you know something, why ask it of some things and not others?
Well, I'm not a liar, for starters, nor would I have any reason to lie (nor would anyone have any reason not to believe me), so there's no real reason why they wouldn't know my intent after I outright stated it.
There ia a mountain of assumptions between that conclusion and the rational default position of uncertainty.
Moreover, I would argue that belief is a positive act. So I need a reason
to believe something; I don't need a reason
not to believe something.