kre62 is correct, a warmer screen has a lower Kelvin temperature and a blue screen has a higher Kelvin temperature. You just have things reversed in your mind.
Whoa, easy there. There's no reason to be flat-out rude towards other's pint of view.
We hear this same thing every year -- people claiming that the first batch of iPhones are always bad. They are convinced that all iPhones are bad and only a tiny fraction of people are lucky enough to get a good screen. Some people even exchange their phone with Apple numerous times. Lucky for them, Apple has over-the-top customer service and puts up with their nonsense. Every year, its the same thing: the yellow-screen crowd shouting from the rooftops hoping someone will actually listen to them.
Here's another example of what I'm talking about above. kre62, I'm glad you returned your iPhone 7 and now its time to get on with your life. As you already said, the 6s is the perfect phone for you and that is awesome. I'm genuinely stoked that it is a great match for you.
But in the meantime, your aggressive attitude towards the vast majority that disagrees with your yellow screen paranoia is unwarranted. It's cool to have an opinion, but it's not cool to exaggerate or shout from the rooftops.