Ars longa, vita brevis
It is not the responsibility of sensible people to persuade every last person in existence of the wisdom of a course of action; that's a recipe for paralysis.
What we have here is someone who expressed an aggressively ignorant counterfactual position and rebuffed polite encouragement to consult primary sources. Perhaps the person is trolling, perhaps they're just a fool, but either way people who make objections in bad faith do little other than waste time, and making endless excuses for them is a further waste of time.
This is why I said elsewhere on the thread that it's time to just move on without the buy-in of that part of the population that rejects the reality principle.
I'm just sad the the first response wasn't something along the lines of: "Why? What does the graphic being a cartoon have to do with how accurate the data and the point it's trying to express is? Why are your experiences in a specific region supposed to map directly towards the overall global scenario? Why are you using hottest days in summer in your observation instead of total hot days, which is actually what's being discussed, since it's possible for the average to be much hotter, even if the largest outlier isn't as high for that year, right?"