I’m not familiar with this Instagram profile but I did click on another post on that profile and saw that the account holder posted a picture showing Queen Elizabeth II and described Baroness Marie-Hélčne de Rothschild as “Queen of the Jews”. Maybe it was intended to be humorous but it certainly made me feel uncomfortable.
As for the wedding, I think you're assessment was way too harsh and the failure to identify anything nice or positive is striking:
The wedding was clearly very commercialised. I know his aunt is supposed to be very wealthy but presumably she didn't pay for this lavish event so it must have been funded somehow.
Grand Duke George tries far too hard for my personal tastes and I’m not sure what his objective is – he can’t seriously believe he is going to be Tsar – maybe there is an opportunity to achieve standing and money in Russia by emphasising his descent from the Romanov dynasty. If you contrast it with the Two Sicillies wedding last week it just had a completely different atmosphere but it is their choice and it certainly didn’t strike me as a “farce”.
It appears from a quick scan of that Instagram account that the relationship between this blogger and Grand Duke George is mutually hostile and the Instagram account holder appears to quite like being provocative (generally, not just in relation to the Romanovs) and Grand Duke George can't resist attacking back. That doesn’t justify any racial comment (if one was made) but maybe if the two don’t like each other, it would be better to block/ignore rather than continue to provoke one another.
It strikes me as odd that the Instragam account attacks Grand Duke George's ancestry and then covers his wedding in minute detail. I say this only because only in the last 48 hours we have heard the sad news about how Princess Mako of Japan has been diagnosed with PTSD as a result of constant press sniping over her wedding. I don't think its at all fair to place all the criticism on Grand Duke George and Rebecca.
The wedding and other venues were stunning. I dream of visiting Russia one day.
I didn’t like the bride’s choice of tiara (of all the Chaumet tiaras available to choose from why that modern horror!?!) but her dress was lovely.
Grand Duchess Maria is always a joy to see! She always reminds me of portraits of Catherine the Great and pictures of her other female ancestors Maria Alexandrovna of Edinburgh and Maria Pavlovna, she is very majestic in her style of dress and manner, kind of like Queen Margrethe II. I loved the fact that her hat during the wedding service was shaped like a Russian kokoshink.
I’m also not sure I can agree with your assessment of the lack of high-profile attendees, frankly I am somewhat stunned by the turn out in these Covid times, especially King Simeon and Queen Margarita due to their ages. I’m not sure why anyone would expect European royals from reigning dynasties to attend a private wedding in Russia given the political issues between most Western European countries and the Russian state, not to mention the cost of security for reigning royalty visiting a place like Russia and the continued risk of Covid.
Just my thoughts.