And who would that be, then?
I looked through that whole thread (which I started), and couldn't see a single post indicating anything of that sort.
And yeah, some people aren't lucky enough to have temps of 21°C inside all the time. I'm lucky to afford to keep it around 15-17 in the day with my heating on as much as I can afford. I'm physically fit and pretty cold tolerant thankfully, but my financial situation isn't the best at the moment. I also make sure to wear plenty of layers.
I do have to keep ventilation in the bedroom, which means it can get cold in there, and that is due to medical reasons, as I have a nerve disorder that means I have to keep my feet cold so as not to get burning pains in them (a sort of neuropathy) so I have posted some low indoor temps in that room. I tend to overheat when I sleep and again this due to the medical condition. Yes temps can get to 10°C in there, no it isn't a "badge of honour" but the only way I can sleep comfortably and the ventilation helps to prevent damp.
Don't go calling people "idiots", not very polite really, especially when you're not brave enough to name who you're talking about.