are there any asseertions which can't be rebuffed with 'well,

you can't rebuff any assertion with just 'well, that may not be the case'

>>9777741
well, that may not be the case

how can the case be if the not of it is always protruding???

>>9777739
i guess just a priori truths. 2+2=4 yknow

>>9777741
of course you can

Not really. You can legit take Descartes's Demon Argument and say 'maybe cogito ergo sum isn't actually valid and there's a fundamental mistake in it that the illusive demon prevents us from noticing'.
But if you ain't a skeptic lotsa stuff.

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812KB, 1067x1600px

No, scepticism rules supreme. Pyrrho and Hume not Paul and Plato!