Of course there are different shades of white, what I am saying is that the color of the sun during the day is what people most would classify as "white" and not as "yellow" if it the color was printed on a sheet of paper.
If the sun color was actually yellow, people wouldn't be able to tell the difference between a white object and yellow object under the sun light (they would both appear yellow). And clearly they are.
On the other hand a white object doesn't get any "whiter" under another kind of light than it appears under direct sun light, this again is because the sun light is white, and not yellow.
Of course there is some subjectivity here, but it is a misconception to call the sun light yellow. For example, this "bright sun" RGB [1] color, is clearly not the color of direct sun light. Hopefully, you will agree with this.
Sunlight is wide-band (see "black body spectrum"). This is why a white object (that reflects all light equally) and a yellow object (which mostly reflects reds and greens) are discernible under such light, even under sunset light which is visibly yellow or orange. The sunset orange light still contains many other colors.
A yellow object and a white object would be not discernible under a very narrow-band yellow light, or a mix of two narrow-band red and green lights of right proportions. This is how LEDs and lasers emit light, but totally unlike hot objects (like Sun) or fluorescent lamps (like "natural light" LED lamps) emit light.
Look, my point is simple: if you agree that snow and sugar are white, then the sunlight is also white.
It has to be because white was historically described as the color of the snow (or whatever is white) under the sunlight.
Now, if you want to adopt a more precise definition of white and other colors, based on (not so) recent scientific insights about the light, you can. Then the sunlight is not white, neither is snow or sugar. And is also certainly not yellow.
Let's be honest, the sun light is almost perfectly white, and kids use yellow to draw the sun, because it wouldn't make sense to draw it with white.
If the sun color was actually yellow, people wouldn't be able to tell the difference between a white object and yellow object under the sun light (they would both appear yellow). And clearly they are.
On the other hand a white object doesn't get any "whiter" under another kind of light than it appears under direct sun light, this again is because the sun light is white, and not yellow.
Of course there is some subjectivity here, but it is a misconception to call the sun light yellow. For example, this "bright sun" RGB [1] color, is clearly not the color of direct sun light. Hopefully, you will agree with this.
[1] https://www.colorcombos.com/colors/FCD440