[sonusario]

The Final nail:

You agree with the following claim: The specific observation of water boiling at 125°C in 1 atm falsifies the claim "water only boils at 150°C+ in 1 atm".

Since being falsifiable is your requirement for making warranted claims about reality, then, in order to be warranted, you'd need to have a specific observation that would falsify the claim "The specific observation of water boiling at 125°C in 1 atm falsifies the claim 'water only boils at 150°C+ in 1 atm'". But now the claim, that whatever observation you may describe would falsify the aforementioned, would also need to have an observation that would falsify it.

Any claim that some claim is falsified by some observation will also have to have a observation that falsifies that claim. Thus leading to an infinite regression (have fun showing your position is warranted when you have to detail an unending list of observations), circular regression (we both agree circular reasoning is not reasonable), or a first claim that is not falsifiable.