2000 degree kelvin light is very warm looking- like a candle, or fire.
3800ish degree kelvin is like light bulbs (with a filiment)
5200 kelvin is about high noon light- and most flash's
6000 kelvin is about equal to a cloudy day
7000 kelvin is a sunny day in the shade
now, if the WB is correct, the subject will look the correct color, whether they are in shade, or lit by a candle. A camera will only apply one WB however. So if your subject is in the shade,(blue, cold light) and you use a lightbulb to light their face (warm light), the camera can only get one right. so the shaded background will look normal and they will have an orange face, or a normal face and blue background/body.
a flash in daylight is about correct.
in indoor lighting it will appear more blue than the room,(and should have an orange filter)
in the shade the flash will appear more yellow/orange than the ambient.(and need a bluer filter)(supposedly at least. I never notice this scenario, but perhaps It is because I prefer people's faces to look warm'ish)
some more confusion: notice I listed the light in degrees Kelvin. The warmer "feeling" light is actually colder on the scale, and vice versa.
think of it like this, a match is a warm light, but a cool temp. A blow torch is a blue light, but a high temp.