The practice of indicating kcals as "Calories" always seemed to be an American thing to me. I don't know how widespread this is outside the US but there are plenty of countries that use "kcal" in nutritional tables and such. People will still colloquially confuse calories and kilocalories a lot but that's largely due to bad translations (similar to mistranslating short billions).
People everywhere mix those 2 regularly and nobody is confused. You don't say you go out for a run to burn some kilo calories and so on. Sometimes places like HN are needlessly pedantic
