Pah! I've never understood it as an issue. As the article says, if one were to say: 'I am a danish', everyone would understand it as nonsense. But in a sentence where something of the sort can be taken more than one way, why do people persist in perceiving it as a gaffe?

If I said that I 'crossed the river at a ford', would someone laugh forever after because I should have said 'in a Ford'?