I have a fair bit of experience with codecs and audio in general. I also consider myself a "purist" and I have pretty good hearing (can still hear sounds above 18 khz).
I also experimented a lot with blind tests.
In my experience AAC 256 and above is pretty much indistinguishable from lossless. Even in the most (un)favorable circumstances (high end audio equipment + zero background noise) you have to be so damn focused to detect the difference that it becomes a meaningless exercise in trying to prove a point rather than actually enjoying the music you're listening to.
But hey, I could be the odd one here. So here's some science to back up my point (clickable link):
Lossless vs Lossy - Blind Test Results.
Can you also come up with something factual about your point of view or you expect everybody else to take a leap of faith based on your own personal experience of the placebo effect?