If the only thing they're complaining about is dark skin color or including some other marginalized minority? Probably.
The danger here is failing to understand people you disagree with and just labeling them bigots. You don't help them in anyway, you just prevent them from explaining themselves. Shouting people down and "canceling" them does not change their minds. It just pushes them away and they will be embraced by more extreme parts of the populus who will try to turn them into actual bigots.
So what non-bigotted reason might someone have? Well I'll tell you my own problem with some of these shows. It is the lack of an explanation.
I thought Hamilton was brilliant. And I thought the Miracle Workers show with Daniel Radcliff was great. Both have diverse casts that do not fit the "historical" inspiration. But they didn't need to, they were not going for an immersive story. Hamilton is a play where you are required to fill in a whole lot with your imagination and Miracle Workers was a comedy.
For immersive stories like Amazon's Wheel of Time and Rings of Power you expect to lose yourself in the atmosphere of the show, not force yourself to ignore inconsistencies because they couldn't be bothered to come up with an explanation.
For instance, the Harfoots are a wandering people. Why not drop a line about how they wander all over the world and when the various troops meet up it is common for people to leave the old troop and join the new one? There you go! Now there is a logical reason for there to have Harfoots of all different races and ethnicities.
For the elves, we have only ever seen them in "The West". Why couldn't elves be different colors in different parts of the world? Or, since they were changing so much anyway, they could make something new up altogether. Heck, just add a line about, "Elves are naturally more diverse than humans." It is a magical world, elves are more magical than "mere humans". Why couldn't they just be born different shades? Nothing like this is mentioned in the books and I am sure it is absolutely not what Tolkien intended, but if you are going to change things at least change things in a way that makes sense.
But there is no explanation at all. The only explanation is that they wanted to have a diverse cast so people wouldn't get mad and that is it. So when I sit down to watch the show and I see all of these different races represented I don't have an in-world explanation, I just have the thought that the studio needed to hit a certain quota so they won't get labeled as racist.
Side note: I have watched the first season of Rings of Power and regardless of the casting the story itself was just ok. Not fantastic, but better than the Wheel of Time in my opinion. Honestly, since they didn't have the rights to the Silmarillion, they shouldn't have tried to just make up their own story for it. Tolkien already has a story and it is better. There were two blue wizards that went to the East that we know nothing about and they could have a cast with no white actors at all and I would have liked it better. Or maybe there could be a real cosmopolitan city over there somewhere where everyone is represented, and since it wouldn't conflict with anything already written it wouldn't be a problem at all.
Final thought. Please try to spend a little more time understanding the people on the other side of the argument and listen to what they are actually saying instead of just hurling insults and you will find you can make new allies instead of creating new enemies.