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I don't think the queen is all that, and she is precisely why we fought the revolution. However, she means much to the British people, and common courtesy would suggest that a couple minutes without his sun glasses would be beneficial for relations .
Admittedly, some folks have difficulty in bright sunlight, but too often we have seen Joe out in bright sunlight without eye protection. In fact, it appears he only occasionally wears sun glasses, even in bright sun..
...Plus England is not usually compared weather wise, with Miami Beach.
I searched for "Bidens at the beach" and here's the photos I got back;
https://duckduckgo.com/?q=bidens+at+the+beach&va=z&t=hc&iax=images&ia=images ...Looks like he could have slipped the shades off for a couple minutes.