brandxbeer :
My cousin has a really nice asus rog gsync 2k 144 htz monitor, with a 1080ti. I play on it all the time, and don't really notice the high frames. I was really disappointed after hearing every one say how big of a difference it was to 60 fps. The only thing I noticed was that it wasn't in 4k.
High fps is much more noticeable in games with a first person perspective where you are turning the camera a lot. Maybe he doesn't have the games running at a very high fps. It doesn't matter how high the refresh rate is on the monitor if he's barely getting 60fps anyways.
I upgraded my GPU from a 1070 to a 1080ti after buying my 165hz monitor because the difference was enough to make me want to take full advantage of it.
Not to discredit your post because that's your opinion but games running at 100+fps vs 60fps is hugely noticeable for me, even in RTS games like Warhammer.