The reason this was such a potent put down is that it speaks to a hidden truth, which is that in politics some topics are considered legitimate, while others aren’t. Sometimes these categories make sense, but all too often they’re arbitrary and misguided. Take childcare, for example. Even though free nursery places would make a huge difference to millions of parents, for a long time this kind of family policy simply wasn’t seen as “serious”, which is why it was rarely put forward by mainstream politicians.