"If a man rapes a woman, he is a rapist."
Of course.
But before he rapes a woman, he's not a rapist, he's just someone who might be a rapist, or might not.
So "being in the presence of a rapist" effectively = being in the presence of most men, when you're thinking of it in terms of your own personal safety.
Saying to most women, who imbibe the rape myths you so patronisingly linked me to, that they are fine as long as they are not "in the presence of a rapist" is saying that they are fine with pretty much any man they know, as long as they think he's a good bloke.
But that's not how it works, is it?
There are lots of potential rapists, who are perfectly capable of rape, and commit low-level sexual assaults on women, that never actually rape anyone because an opportunity doesn't present itself.
So if you present them with that opportunity, you are more vulnerable.
That doesn't make it your fault, or him not a rapist, or OK for a policeman to say you were asking for it.
But TBH I"d rather not have to be in the position of fighting those losing battles and just recognise the reality of the world we live in - that being drunk makes you vulnerable, and that women, in this society at this time, are extremely vulnerable to rape because it is pretty much legal unless someone jumps out from behind a bush and attacks you with a knife and you are modestly dressed, perfectly sober, and shout "No!" very loudly.