I wouldn't say that. It depends on the user.
Imo dead pixels are pretty noticeable @106ppi. If this was an UHD monitor @27", then it would be 163ppi and not noticeable at all.
But if duganator doesn't care about the one dead pixel on his shimian monitor, then I think he won't care about the one on the xb270hu
Its just an user thing. But it also depends on where its located. If the dead pixel is somewhere near the edge of the monitor, then I think I would be fine with it too. But if its somewhere near the middle, then it would be pretty awful.