her rights to refuse service to anyone on any grounds
Usually true, except when it comes to discrimination against people of protected class for being under that protected class, which is why this ruling is so concerning.
The reality is that this sort of discrimination happens all the time under the guise of other rationale and is hard to stamp out (see: real estate redlining, gerrymandering, employment and rental discrimination, etc.), but theoretically a disenfranchised person with documentation can still seek recourse under the law.
This ruling (as well as the general apprehension around queer people living publicly) has laid the groundwork for christofascism to further underclass those (and other marginalized) communities and makes the violent rhetoric coming from "family values" white supremacist extremists more palatable to the public.
It is incredibly dangerous and further damages whatever remains of SCOTUS' credibility.
Well said.