Thanks for your detailed post, Zuluqueen.
I haven’t read Sarah Vine’s article for many years, but I do genuinely think that Meghan’s engagement photo shoot was a notable departure from what had been established as the norm in the British Royal family. They were stunning photos, but were editorial in style, and some featured Meghan in an extremely expensive couture (said to be £70,000) Ralph & Russo dress.
You, and many others, will have said “Why not? She is American, where having a glamorous engagement photo shoot is totally the norm. She’s, not British, she has her own money, why shouldn’t she?”. And that’s fine - I said/thought pretty much that at the time myself. But undeniably, glamorous shoots in evening gowns were very much not the norm of the family she was declaring her intention to join - her predecessors had worn off the rack/high street brands (while showing their hugely expensive engagement rings for photos of course - but that is the uneasy tightrope they walk here). And to my knowledge, “dressed up to nines” engagement photoshoots are not really a British tradition either.
So I can see how people would have looked at the photos at the time and thought that they were lovely, but they looked more celebrity and American than royal family. And wondering if Meghan really understood what she was signing up for. And how difficult she might find it to adapt to a wholly different culture.
As for people seeing the headline and reacting to it as a coded slur - well, I think some of those responses were because that was how various international media chose to interpret it. US Vogue certainly did so (despite having previously used the phrase “niggling doubts” itself in its own content).
The word actually came into English from Old Norse a long long time before any other associations. I mean to be honest, Niger and Nigeria are far more problematic than niggling, as they come from the exact same derivation as the actual N word. But we accept that those are appropriately used in context, and not because the user has an ulterior motive. It doesn’t mean that some commentator somewhere couldn’t say they were provocative, though.