Oooh, I get to say an “Umm… Actually” fact. File names are not case sensitive in Linux nor are they case insensitive in Windows.
It’s entirely possible to have a case insensitive filesystem on Linux (I think ext4 supports a mount option for it now). Likewise, there’s a bit you can set on folders in Windows that makes its contents case sensitive. So realistically, case sensitivity is a property of the folder, not the OS.