Dark mode fans: does it really bother you to read white web pages?
Probably has something to do with having an all black background on desktop / IRC, terminals, steam since 1996/1997->now
Even MSN Gaming Zone where I started was 'dark moded'
If a site is borked to the point that Dark Reader can't fix it, I'll use reader mode or just go somewhere else.
Your site looks just fine to me.
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.
I'm sure there are still plenty of people who would appreciate a site toggle for dark mode with a theme of your choosing.
I'd say it's more of a courtesy thing. If you like a bit of a web design challenge, you can experiment with the prefers-color-scheme CSS feature. With this, the browser will automatically apply the dark mode for users that have it set, making the experience seamless (and state of the art).
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.