"The trouble with some people, said the late Ronald Reagan, is not that they’re ignorant. It’s just that they know so much that isn’t so."
Actually, he said, "The trouble with liberals is..." It was not a generic reference; it was targeted precisely at liberals. (Some sources report him as saying "liberal friends", and perhaps he did word it this way on occasion.)
So, we all should be careful with what we presume to know, especially when we write articles supposedly quoting others.