Watch: John Lennon’s son Sean blasts Prince Harry on the way he whines and wangs on about things. He called Harry a “buffoon” and an “idiot.”

Here comes the review — one year later.

John Lennon’s son Sean Lennon belatedly bashed Prince Harry’s “Spare” memoir on social media, giving the January 2023 release a scathing critique.

“My long awaited review of Prince Harry’s autobiography is two words. ‘Spare Me,’” the musician, 48, joked via X on Wednesday.

When fellow social media users came to the 39-year-old royal’s defense, Sean doubled — and tripled — down on his negative review.

“I do empathize with him generally. But the way he whines and wangs on about things is really too much,” he wrote on Thursday. “I’m just having a little fun. I think he’s earned some mockery. (I’m sure I have as well).”

When one fan wrote that writing “Spare” took “courage,” Lennon joked that the particular memento about Harry’s frostbitten penis “certainly” did.

Sean also clapped back at claims that he “based his whole life on his father’s success,” pointing out that he “did win an Oscar this year” and is doing “OK” for himself.