Glow in the dark, Glowie, Glows, Glowfag, Glownigger:

The term was coined by Terry A. Davis, a computer programmer diagnosed with schizophrenia, who allegedly believed that the CIA was stalking and harassing him. “Glowie” is often used in online forums to refer to government agents, especially undercover operatives who infiltrate online extremist spaces.

“Glow in the dark” and its derivative terms have been used to refer to various groups: newcomers that do not fit in with the culture of certain forums and are thus suspected to have bad intentions, journalists who report on extremist groups, tech companies that collect users’ personal data, and others.[1][5][6][7]

I looked at the explanation there, which mentions shizophrenia and IT origins.
I see now that the list of words contains racist etc. variations, which I’m guessing is what you are referring to?

Personally I have seen glowie used in “shizophrenic” places worrying about privacy and government surveillance and the likes, but I have never seen the questionable variations nor seen any racist people or content in combination with “glowie”.

Is this a guilt by association thing? Where the inventor of the word was racist and used it in racist variations so the base word itself is taboo somehow?