Maybe I'm blind, but I've never picked up on this attitude. I may have met one or two individuals like this, but I've shrugged them off as holier-than-thou individuals (who exist in all disciplines), not part of a wide-spread attitude in the field of photography.
I will say: There is probably some annoyance among serious photographers at the claims that an iPhone is on equal footing with a high end DSLR/Mirrorless camera. It's true that some mobile phones take a-mazing photos that truly can rival some high-end cameras, but that's usually in a very narrow context, and much of the creative input of the photography process is either automated or simply not cared about. As long as you're not claiming that your iPhone is on par with someone's Sony a7R IV and implying that there's no use for such cameras because iPhones are "replacing" them, then I think most #serious photographers don't give two-hoots what you're shooting with. Different cameras have different applications that they're the best fit for. It's all about what works for you, and part of that, frankly, is the enjoyment (I shoot high-end digital, point-and-shoot digital, manual 35mm film, and kodak funsaver disposables)
Frank Thorp, a professional news/political photographer, shoots with a fancy-pants Sony a9, but also does a lot of disposable film cameras!