Haze color varies quite a bit on where and when you’re flying. It is quite blue in places:
If you’re used to the greys and browns of more urban areas, it’s going to look too blue. One of the issues with Flight Simulator currently is that Live Weather isn’t taking visibility conditions into consideration really. So the default blueish haze of the “unlimited visibility” is pretty much everywhere when it should be mixing in some of that brownish “aerosol” that’s in the weather menu, and some greyish mist like you see with the precip.