I recommend any reader, and you particularly, use google. And see for themselves the wide range of usage for the term. It really does cover many disciplines.
And yet, just because you personally don't understand when gatekeeping is happening to you so you can use the term effectively, doesn't also mean others don't understand and will use the term.
You seem to be well stuck in a rut with repeating "holocaust deniers, anti abortionists". (I see you have started repeating US Social conservatives and now also anti-LGB bods too)
I read your OP in one of your threads that you were in advertising for 25 years! So, I guess you work on the principle that if you repeat something enough times that you will eventually convince someone.
"Yes, there’s some logic in attacking accusations of “guilt by association”. But this isn’t an undergrad seminar, it’s real world politics. The company you keep has a significant effect on your appeal."
And there is both the sleight of hand dishonesty and the very tight purity spiral polarisation.
"But this isn’t an undergrad seminar, it’s real world politics."
You obviously haven't actually thought this through.
Real world politics is ALL about presenting to a wide range of people, even those you disagree with.
Real world politics means working on committees with people you don't agree with on many, if any things, but want to make sure of an outcome that you can live with.
Real world politics means having photos taken with people you abhor.
"The company you keep has a significant effect on your appeal"
The 'company' you keep. Who is she 'keeping company with'? You mean friends? Who are her 'friends'? Do you not have friends and family you disagree with but still love? Well... adulting is very hard, we know.
Or do you mean being seen at the same conferences or events with? Do you believe that politicians never attend a conference that they disagree with the organisers on to present an alternative view? Do you believe that politicians only ever give interviews to channels that fit the purity they desire to be associated with?
Your example is quite something.
You are either now declaring that KJK is best friends with holocaust deniers,
or
you are trying to tell us that politicians don't ever appear on a program, an event or a media channel unless everything about those programs and events and media (organisers, audience and other speakers) 100% fit all their beliefs.
or
you really don't have much real life experience outside a very curated bubble.