He's right and its one of those things you dont notice until its pointed out but once its pointed out you notice it everywhere.
I think the feeling of intrusiveness is the same for both devices but the difference is the ease of confrontation. Its much easier to confront someone with a camera because the intention to shoot a photo or to capture a moment is so clear and honest. Whereas someone with a phone can minimize the intent by saying they're only snapping a quick insignificant photo for any millions of reasons and we have to accept that or look unreasonable.
I think the feeling of intrusiveness is the same for both devices but the difference is the ease of confrontation. Its much easier to confront someone with a camera because the intention to shoot a photo or to capture a moment is so clear and honest. Whereas someone with a phone can minimize the intent by saying they're only snapping a quick insignificant photo for any millions of reasons and we have to accept that or look unreasonable.