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It's almost like I disagree with your use of the phrase in this context, rather than that I don't know the meaning of it.
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So you defined your own idiosyncratic version of "moving the goalposts" and used it to rebut his argument, with a condescending "you understand that's how science works, right?"--instead of being honest that it is you who are changing the definition, and not his failure to understand anything.

I don't see how that's any better.

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He rebutted the argument about moving the goalposts by moving the goalposts. It’s better by dint of sheer bravado.
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How were any of us meant to know that you were using your own personal and undisclosed definition of a well-established phrase?
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