This was the first time I'd ever heard this rule, so I was rather surprised by the comment. I looked it up, and it seems there are differing views on the subject.

So ... I actually posted a poll on the subject, to see if people taught traditional/British English (as either first or second/other language) vs. those taught American English had different views on it.

I hope you don't take the post as an attack on your comment, because it wasn't meant as such. I was simply curious after researching the subject. And I always welcome comments if I've made a mistake. Truth be told, I'd have been horrified to find out I'd made such a mistake for years, but would have welcomed the correction so I wouldn't make the same mistake again. :)