They’re not calling people dumb for not knowing, they’re calling them dumb for not investigating. If you hear a wild claim, you should investigate. This shouldn’t still work because most of us here know it’s been a running joke for at least 20 years in the US with continuous anti-Muslim and anti-middle-easter/Arabic sentiment and bills post 9/11.

It shouldn’t be incredibly confusing, either. It’s fine to not automatically know that Amerocan/English refers to “western Arabic numerals” as simply “Arabic numerals” in shorthand. I didn’t. That’s why I briefly researched it when you said you had a different set of numerals in a region. Since I don’t know exactly what to look for to validate my own searches, I genuinely asked you if what you learned matched what was in the Wikipedia page. I have no direct experience.

People use shorthand all the time. It makes things confusing. I didn’t know a “convection oven” was actually a “forced convection oven” until this year. In my head, it wasn’t something I ever questioned because all my ovens have had the primary heater at the bottom, meaning convection would carry hot air upwards. Turns out, FCOs have a fan at the top to force better circulation. Surprise, this revolution of air fryers? They’re just countertop [forced] convection ovens. Similarly, I have a gripe with people customizing cars with “coilovers”. The majority of cars already have coil[spring]-over-[shock]s, but what they mean is “adjustable coilovers”. It’s a carryover from when cars did NOT have the various coilover designs as standard. Shocks outside coil springs, leaf springs, torsion springs, etc.