King Charles and Queen Camilla’s successful US tour this week underscored just how idiotic and ill-conceived Prince Harry’s behavior has been over the past six years.

He was not invited to any of the high-profile events in Washington — where the royal couple attended a state dinner and Charles addressed Congress — or New York City, where the king and queen laid flowers at the 9/11 Memorial in the morning and partied with celebs at night , despite living in America himself.

In a different world, there would have been a place for Harry, a natural-born people person. But he has pretzeled himself into an untenable position with his mad ranting about how the royal institution tried to “destroy” him when he stopped playing their game — and all the tears from his wife Meghan Markle over her alleged treatment within the palace walls.

As one royal insider told me, it boils down to consistency.

King Charles spoke at the state dinner thrown by President Donald Trump at the White House Tuesday.…