Do you really think you should have the right to disrupt the funeral of someone you don’t like?
In case I'm misunderstood, I don't feel strongly either way about the British royalty, but I'm OK with allowing a significant proportion of the population being left alone to get on with what ceremony they want to do, given that they want to do it.
Is Putin coming?
If not, why did you respond with this to a question about is it morally right to protest at a funeral?
Even more so if the public is the one paying for the funeral in the first place. You're definitely allowed to be rude at a funeral you're footing the bill for.