If this were Brookside, then I would say, sure, but nothing is realistic about Corrie. To suddenly have all this hostility about the royals, to the point of smashing plates of them, seems more like the agenda of a writer, than any attempt at realism. It doesn't help that everything on Corrie now is so nasty. There is no humor unless it involves deriding people, and this is the same.
Besides, if the people who do Corrie now hate the Windsors that much, then they're hypocrites for allowing Camilla to participate in the anniversary last year. I doubt the people in working class communities liked Camilla more last year than they do this year.