I'll bet vanishingly few of the people with their hackles up over this spoke out in favor of the Westboro Baptist Church when it was in the news for their funeral protests.
Westboro was heckling at funerals for (and attended by) private citizens. The monarchs are public figures. I could imagine some hypothetical reasonable person seeing a difference based on this.
Private funerals and a multi day, country wide state funeral procession are just not comparable.
You’re comparing heckling a persons funeral over their sexual orientation to heckling a pedophile rapist. How do you make that connection?