Let's cut to the fundamental argument here. Government should NEVER be allowed to dictate your state of mind and should NEVER be allowed to dictate based on feelings instead of facts.
If the judge wanted "reasonable" in that sense, then they should have defined the limits of reasonable. The assumption that "reasonable is what I the judge consider reasonable" is bad in every conceivable way. You can't read the judge's mind. If they didn't say exactly what they meant, then it is the judge that is at fault.
Next, the judge is an expert in law -- NOT an expert in humane interface, UI, or UX. They are in NO position to exert their amateur, ignorant opinion as fact and no effort was made by the judge to consult experts in the field about what would generally be considered "reasonable".
Finally, reasonable is subject to the facts and how those facts are subjectively viewed. Most Apple employees likely view this ruling as bad for their consumers and feel an obligation to protect their 1.4B iPhone users. From this perspective, discussing how to dissuade people from making decisions that could harm them would be very reasonable even if that discussion had a light-hearted tone or some joking along the way.
As an aside, I actively dislike what mostly amounts to forcing Apple to implement California state law outside of the state of California. I get no vote in California and should not be expected to abide by their laws in which I have no say. This whole thing should have been dealt with a the Federal level as it is obviously about interstate commerce and should have been legislated by congress rather than a politically-appointed judge that nobody voted for.