I’m British too and like many other Brits I’m sick to death of your droning argument that we don’t consider “cunt” to be a gendered insult. I can speculate about a possible reason you think – or at least say – this: the insult “cunt” seems almost interchangeable with other insults, some also gendered (such as “dick”), and others not.
Unfortunately, there’s only one tiny flaw with that argument: it is bullshit. It’s bullshit partly because “cunt” is always known to be a worse insult than any of those others. It might be argued that this distinction is arbitrary; that “cunt” is considered worse solely due to historical accident independent of the more literal meaning of the word. I’d be as impressed as I would be surprised if anyone managed to come up with a plausible argument along those lines, but I think that’s what you’d have to do to realistically claim that “cunt” is not considered a gendered insult in the UK. Or perhaps you could argue that usage of “cunt” to describe female genitalia is obscure in the UK. Of course, we all know that this is anything but the case. Nobody calls someone a cunt in isolation of its anatomical meaning. You know and they know what the word means and you both know you know they know it.
Your sadly popular argument seems almost to be saying that the insult “cunt” is not gendered unless someone is being explicitly and literally compared to an actual cunt. That relying on the implicit baggage the word carries somehow renders the insult not gendered, even though everyone involved understands that baggage perfectly well.
If “cunt” used as an insult were not pretty much universally considered a greater insult than words like “dick” or “prick” and those words used with roughly the same frequency in the same sort of circumstances, then the fact that “cunt” is gendered wouldn’t be so much of a problem. But you know perfectly well that “dick” means someone casually or relatively mildly unpleasant and “cunt” means someone exceedingly, deliberately, habitually, maximally unpleasant and you know what else those words mean.