No, vitamin d deficient northern europeans occasionally getting in the sun and experiencing the health benefits for a few weeks is really nothing to do in any way with discrimination based on skin colour ('colourism'), which through the variations of colonial experience expresses itself around the world in slightly different ways, but in which universally the whiter the better is the bench mark.
So much written on this, its a massive topic, here's a wiki to start, but an occasional summer tan really doesn't feature in it at all
en.wikipedia.org
Where this is all relevant to the thread is whilst it is on one level of course correct to say all racism is bad and all racisms are equally bad, there unarguably are degrees of experience in different places and different times....there's an objectively existing, experiential hierarchy of racism in the Labour party for example.....there's an objectively existing, experiential hierarchy of racism in Brasil based very closely on gradations in skin colour based on anti-african racism, there's an objectively existing, experiential hierarchy of racism in getting stopped by the police based on skin colour in the UK, and so on. Those two realities (all racism equally abhorrent and hierarchical experiences of racism) are not mutually exclusive