Tbf, we don’t know when the NFT was bought. I firmly believe that people have the right to be dumb, especially as kids. His dad making fun of the NFT, depending on when it was, is also a show of “you were dumb as shit”, a sentence which emphassises “were” - which is past tense. “Comparatively to your present self, you were dumb” which ‘inverted’ is also “Comparatively to your past self, you are smart(er)” and they should be proud of themselves for their personal development and growth.

For clarity, no matter when one buys an NFT, it’s just a dumb thing to do, not saying otherwise; I’m approaching this exclusively from an emotional standpoint to ‘when’ someone does something stupid and ‘whether’ they ‘grew out of it’.