Cannot believe I am going here, but, as a professional writer who has been paid numerous tens of thousands of dollars over the years for his words, FWIW...
Wait for it...
LondonJohn is correct. Vixen is wrong.
It's genuinely extraordinary, isn't it. The distinction is crystal clear to anyone with a) any grasp of the English language, and b) the most basic ability to read, comprehend and synthesise the definitions of - and differences between - the two different figures of speech. Yet here we have, in full-on Baghdad Bob style, somebody (un)heroically clinging to their incorrect position in the face of cast-iron evidence to the contrary.
It is comparable to somebody saying (for example) that Owen Wilson is the current President of the United States of America, then being shown categorically and unequivocally that Barack Obama is the actual President, then saying "No! I know I'm right. Owen Wilson is the President!" And then, to boot, accusing the person who has shown them to be wrong of some sort of bizarre fault related to (AFAICS) use of google or dictionaries......
And as others have suggested here, I think that this little episode - as peripheral and somewhat trivial as it was - is nonetheless very illuminating in trying to figure out how/why so many pro-guilt commentators hold their beliefs in the guilt of Knox and Sollecito and harbour so much hostility towards them (and anyone who speaks out in favour of their acquittals and/or innocence). And in turn, I think it can provide a useful education in how easy it is to forget that so many righteous "arguments" (9/11 conspiracy theories, Moon-landing-hoax theories, belief in the guilt of Knox/Sollecito) are not based on what we would necessarily consider to be sound logic, testable (and rigorously tested) hypotheses, objectivity, critical thinking and intellectual honesty. Most of us would view these elements as fundamental and mandatory, but some do not. And the abandonment of these golden rules of decent argument and debate can, sadly, result in evangelical, self-supporting positions which not only remain immune to attack from logic, reason and intellectual sincerity - but also these positions often actually get hardened and even more entrenched when under attack in this way.
When I first engaged in the online discussion/debate about this case, I exclusively read and wrote on PMF (I'd never even heard of JREFF-as-was at that point). Even though I started my online odyssey with a belief in guilt (based upon "facts" in Darkness Descending which I later found to be false or misrepresented), I was still disquieted by two things in particular: the near-beatification of Meredith Kercher by (seemingly) most of those who believed in the guilt of Knox/Sollecito; and the certitude of the pro-guilt community that the Knox interrogation of 5th/6th November was entirely "Kosher" and that the evil Knox had blurted out Lumumba's name out of thin air amidst an idyllic scene of herbal tea and cakes and a gentle invitation to tell the police more about the night of the murder. Furthermore, when I asked more questions about both of those areas (pointing out that the alleged personal qualities of Kercher were of very limited relevance to the case, and that it was rationally impossible to escape at least the suggestion that Knox was improperly coerced in that 5th/6th Nov interrogation), I was quickly met with hostility from the mob.
It was around that time that I realised that there were strange things going on amid the internet commentary groups in regard to this case, and particularly and specifically among the pro-guilt community. At the same time, I educated myself much further in the case. And within weeks, things started to become very clear indeed.