I'm not trying to wade into the rest of this argument because it seems a bit messy.

But uh,

https://en.wikipedia.org/wiki/Invasion_of_Quebec_(1775)

https://en.wikipedia.org/wiki/List_of_extreme_temperatures_in_Canada#Lowest_temperature_readings

Monday, February 5, 1923 Doucet, Quebec −54.4 °C (−65.9 °F)

Took me just a few minutes, so I figured I'd point out that you're at least wrong to say it's a ridiculous claim to make. It was before we we recorded temperature regularly and (especially in Fahrenheit) the records are much lower than -40.

Don't really care one way or another about your petty arguing, but I always find it obnoxious that people make stupid, ignorant claims, with such a derisive tone, and can't be bothered to do a few minutes of searching. Be smart and a dick or ignorant and friendly. You picked a shitty combination.

Counters to basic/dumb points so I don't have to respond:

https://www.extension.umn.edu/agriculture/horse/care/equine-winter-care/

they can tolerate temperatures as low as -40°F

If you're going to say you were talking about the horse bit, here's some evidence it's possible. You're probably right didn't happen at -40 on a horse, but only a pompous idiot would call someone delusional and tell them to "fuck outta here" when they're too lazy to bother thinking about the shit they say.

If you're planning to talk about George Washington's light involvement in that battle or similar situations, here's some fun reading for you:

https://en.wikipedia.org/wiki/George_Washington

There's several bits about him traveling far up north. Thanks for the motivation for me to give myself a history lesson. I don't mean to be a dick, but maybe some sources to make sure you understand your tone and the term were "delusional" were too far and make you look dumb were a fun lesson on humility. :D