It is hard to discuss without knowing the product or the advert really.
And as Queen Camilla rightly points out, some of us won't see a certain advertising campaign at all - I don't watch adverts on tv, I don't read paper magazines, I don't drive through anywhere I can see advertising boards much (well I haven't seen one for at least the last 9 months).
I don't listen to live radio that has advertising.
So the only advertising I see is that which the likes of Facebook, instagram, tiktok and mumsnet and a few web based computer games serve at me.
That adverting is heavily tailored to what I have talked about or looked for online recently (currently, scroll saws and robot vacuums, I lead such an exciting life).
I don't think that the skin colour of whoever is in the advert would determine whether the product or service was 'for me' or not (but can we ever be truly aware of our own biases?).
But .. I am a fat, disabled, woman who is 42.. and white, and those three/four things ahead of 'white' define me far more than my colour - so when I am looking at advertising, its those things I am thinking of more.
When I go out in public, it is the first three that people see and judge me on most (again... I think!).
As far as white privilege goes - I think it is possible for privilege in one area to be trumped by other factors.
I've absolutely been discriminated against and denied opportunities due to my size, gender, disability, northern accent, poor economic status (variously I am of course a greedy disgusting pig with no self control, idle, lazy, have brought it all upon myself, am evidently stupid and weak, poorly educated and no ability to manage my own finances, probably spent it all on cake...).
That in real terms means I have been spat at and abused in the street (multiple occasions beyond count, spanning almost 30 years), had neighbours start petitions about me to get me evicted, been accused of thefts, had my flat raided and searched following a break in at a local shop that was in fact reported to the police BY ME, because I was seen at the scene... and was poor and living in supported housing so obviously a criminal)... the list goes on and on.
So I can understand that some people may well feel like white privilege doesn't exist... it possibly doesn't for them, in that moment - but that doesn't really matter... the fact it exists for the vast majority, thats an issue.