> had just gone through several centuries of horrific mass-murder of non-Christians in Spain,

Well it varied, but such behaviour was not strictly unique to Spain in those days. Being a Catholic in England wasn't terribly exciting either.

Then you have the witch hunts across must of Europe which resulted in probably well over 10x times more people being murdered in Germany alone compared to the inquisition and they weren't really a thing in Spain.

In a way the Spanish Inquisition was quite similar to the NKVD or the Gestapo/etc. since the persecutions were usually intended to impose ideological/social conformity (or inherently racist in how it targeted even perfectly honest Jewish or Muslims converts) rather than "ritualistic".

Of course Christian Spain is interesting in the sense that it turned from one of the most of tolerant societies in Europe to the one of the most intolerant ones in a couple of centuries.

e.g. during the Almohad invasions you had Christians, Jewish and even moderate Muslims fleeing to the Christian kingdoms which generally were much more tolerant at the time.

> Can you see how this absurd double standard may come across as racist?

That's not particularly new in Europe though. e.g. the Greeks and Romans found Carthaginian mass child sacrifices extremely abhorrent yet at the same time didn't see much of an issue with "exposing" unwanted infants. Treating violence due to economic/utilitarian/political reasons differently that doing it for ritual/religious reasons was is still pretty ingrained into western culture.