There are few things that stir me into a frenzy like idiocy given the cover of legitimacy paired with condescension. We've all made a mistake and been corrected and felt like a complete fool. It's humiliating. Years and years later I will remember these moments will shockingly intense shame.
And it's a hundred times worse when you correct someone else and are wrong. Particularly when they know, right then and there, that they're right and you're wrong. It's such a terrible experience I don't imagine many people make the mistake more than once, at least not after they've learned to understand those interactions. This is how we learn humility. It's brutal, but it needs to be.
As a side note: I'm all about exposing people to rough feedback when appropriate. People need push-back to grow. I don't know why people react as though I'd ever be mean to someone because of this, or why other people say youngsters are being too sensitive if I can elicit any reaction from them at all. They're both confused – the whole point is that normal humans should be capable of shame and feedback. Some things should be mighty hammerblows to their confidence. This whole process can be (if you're a bit careful) pro-social. So maybe just calm down and notice we're all in this together.
So when I see someone make the point that street signs in the UK don't have accurate footballs, and in fact are so inaccurate as to be literally impossible, I smile a bit. Because this is the caution of a careful person! He's not shaming people on a whim, unsure if he's right. It stands to reason that you certainly could use any shape. So he went through the effort of proving himself right.
But to look at that and tell someone they're being inappropriate is... I would fire the person who wrote that response. How could you possibly have a high-quality government if you can't respond at least politely to someone mathematically proving your work can be improved easily?