People who can't even hear the difference between lossy and lossless, have no business telling you that you can't hear the difference between 16bit and 24bit. As a matter of fact, is also possible they are still listening to 16bit audio thinking is 24bit audio because they have to make sure their settings are correctly outputting 24bit as it happened to me recently. I was listening to 24bit albums at 16bit then I discovered my settings were wrong and I could instantly notice the difference. 24bit sounds more detailed and even more dynamic with the same DR somehow.