It’s because the response "you have to respect that some people feel differently than you" implies in one breath that a) I don't respect or understand that others should have a differing opinion
But you don't understand or respect it. You said so yourself:
"I think it's a case of not understanding why others would want to do it in the first place. I for one can't understand why someone would voluntarily make a show of their inferiority (or vice versa be on the receiving end of a show of superiority)."
And went on to call it "silly".
And when I said that you didn't have to understand it, and of course you are allowed to think it silly, you accused me of becoming "aggrieved".
You don't even know whether I'd choose to curtsy or not!
The only double standard here is yours, although maybe it's just plain old dishonesty and back pedalling. If you do understand and respect other people's points of view, don't state otherwise. And don't start the whole "why are YOU getting so aggrieved" nonsense to try to imply that you're the only one who's calm and considered and everyone who disagrees is just irrational. It's not fooling anyone.
Nobody cares if you don't want to curtsy, including the royals. Don't want to, don't do it. It's not invalid just because, by your own admission, you don't understand it.