Yes. There's a reason that https://darkreader.org/ has 10 million+ installs while no inverse extensions even exist to my knowledge.
The entire web is already light-mode first and much of it, including your site (no offense) offers zero built-in support for the provably massive demand that exists for dark-mode color schemes.
That's awesome. I'm glad your friend is able to benefit from community-provided solutions to a real problem that many people have, even in ways perhaps not originally envisioned by the authors of Dark Reader.
Your friend's preferences are valid and there's no reason for anyone to be vindictively espousing vitriol at those preferences, just like the preferences of the majority of users of this extension who prefer dark mode.
The entire web is already light-mode first and much of it, including your site (no offense) offers zero built-in support for the provably massive demand that exists for dark-mode color schemes.