It's not being disrespectful. Some people can see the flicker of fluorescent lights, I can't. I used to be able to hear a 16 KHz tone, but not any more. Some people get seasick. I did once, when I was already sick with some Aussie bug from Perth. The rest of the time I was fine. People are not identical.
I doubt I can see the difference at 120 Hz refresh either, but I haven't had the chance to try.
Back when I was in the workstation business at DEC we had a huge debate about changing our large (at the time) monitors from 60 Hz to something faster. The Human Factors team did studies on this very topic.
Now, this was ~40 years ago, but I doubt the human animal and its visual system has changed much. The results were that about 1/3 of the people saw 60 hz flicker and that dropped off fast. at 66hz less than 1% of those tested saw the flicker and when it was pushed up to 72Hz it was less than 0.1%.
However, at the time the cost of doing 72Hz on those "high resolution" (1600x1200) displays was pretty high so we settled on 66hz as a compromise between cost and the ability for people to see.
Somehow I doubt that any significant portion of the population can see refresh at 120hz. But it does make for a good marketing claim, after all we all know that bigger is better right?
