...insist, without irony, that there's only one way to do certain things (i.e. THEIR way)?
I was reading an online recipe for choccy brownies and someone contributed a post saying in all seriousness that we Brits had the wrong idea because the ONLY way brownies should taste was, god, I don't know, crumbly instead of fudgy or summat. WTF? If they taste good, who cares?
Similarly a friend of mine once admonished me for drinking my Rooibos tea with milk, saying: "you're not supposed to drink it with milk!" Huh? Why should there be a rule for how to drink tea? And why should it matter to her how I drink it?
Actually, come to think of it these people always seem insistent about inconsequential things that really shouldn't matter to them in the slightest.
Bless.