I stand corrected, then! Linux gamers
will complain if you don't support a wide range of configurations. I guess I had hoped that they wouldn't be that entitled (I'm a Linux user only using Ubuntu because I know how difficult it is to support a bunch of whacky setups).
I see two reasonable paths forward from here.
The first is to intentionally avoid supporting Linux, pointing to examples like this one, until Linux gamers get over their entitlement at not having super-obscure things like ratpoison, OSSv4, or a particular configuration of DLLs installed supported by games.
The second is to only support a single Linux configuration. This shouldn't be a ton of work, and still allows you to capture a small amount of revenue from the ecosystem (as well as getting some goodwill from the community - "no Linux support" is something people can beat you over the head with without sounding too unreasonable, but "doesn't support my Linux-from-scratch setup on my toaster's MIPS processor" is not).