The people trying to use Winter to disprove it would be all the folks going on about the Arctic cold spell that has descended on the US and Canada the last couple of weeks.
Somehow your liberal education skipped over the fact that Winter in the Northern Hemisphere is SUMMER in the Southern Hemisphere and that Antarctica is in the Southern Hemisphere. Y'know, the area where those Global Warming Hysterics were frozen into the ice that, according to their Gurus, can't possibly exist. They should have been left there because their predicament was obviously just a figment of some "denier's" imagination.