I often see people downvote questions on SU simply because they mention running Windows XP, with snarky comments about how "you shouldn't even be using XP anymore". Except that, sometimes users may not have a choice.
Maybe it's a work PC that they can't do anything about. Maybe their hardware can't support anything newer and they can't afford an upgrade. Maybe they're still on XP due to software compatibility reasons. Maybe they like tinkering with old OSs.