While I understand the sentiment (and harbor it myself) this sort of "I'm rubbing your face in it" rhetoric does nothing constructive. It isn't propaganda for would-be Trump cult survivors. It's mere pandering to those on the right side of history by sneering at "the other".
If I saw a crack in any of my MAGA-cult relative's façades or genuine walls I would leap at the opportunity to commiserate as an entry point to more reality-alignment discussion and see how far I could get.
People must stop doing harm before being taken back in as comrades but they're still human being who deserve, and must be allowed by society, the opportunity to improve themselves and their behavior.
Disallowing that leads to much worse alternatives. Barring genuine sociopathy: we seek, and are often driven by, acceptance. It's part of what soliciters of right-wing ideologies (e.g., manosphere) exploit, especially with young men, to convince them alignment with fascist theory as a way of life emotionally and sociopolitically must be within their best interest.
But let's even go so far as to discard empathy and sentiment for a moment. If we set our humanity aside and consider this strategically (transactionally) then I see this as an opportunity to potentially mitigate harm. I am going to seize that advantage. Even if I've lost hope for that particular cultist. Taking the time to be supportive of (what may only ever turn out to be) a lapse in otherwise perpetual cognitive misfire may divert their path from "worst outcome" to "unacceptable but not an active threat". I cannot effectively work with material if I find the material revolting.
I think even this colder perspective pushes us closer toward exercising empathy though. Because that's the pit in my stomach that churned injustice into compulsion for radical action. The deep-seated stark truth that every feeling creature deserves respect and the opportunity to create safety together. That the promises of authoritarian rhetoric are a perversion of literal civilization.
At possibly its most blunt and mundane: "I don't want other people abusing me, and; if I think I am the same thing other people are then it's not going to feel good, or be reasonable, for me to abuse others.
Sneering is for snobs. The snobbish turn their nose at impure things because of, at least in part, their disgust of what's stained them. Transposed onto persons directly that disgust reduces one or some of us to merely a point on which one may anchor one's rage.
I won't do that. Both because it offers no advantage in advancing even triage to response, let alone treatment, and because I find it distasteful, at best, without effort.