Deja Vu to FOTR.
I think what many are experiencing is the ability of the human vision system to recalibrate in the absence of a reference object in the field of view.
When a screencap is viewed in a browser, there is generally reference white somewhere nearby, so any colour bias will be obvious. If this screencap were viewed on its own with a completely black background within the field of vision, I expect most would see those orangish flags as being more red.
Consequently, people seeing more yellow, than others, with the same source is quite consistent, depending on how each person is viewing the material. There is no point in accusing others of being colour blind, apologists or in denial because individual experiences are all very subjective.
Personally, I don't think it is a good idea for the colour timing of a movie to be altered, on the assumption that the public will be watching in a completely dark room and the perceived colours will adjust themselves, because some will be watching the movie in environments where reference white in the field of view may result in a very different effect. I consider it sloppy to not maintain reference white when adjusting those hues the director wants to accentuate, for effect, but it is probably easier to just push everything in one direction.