After Jack Schlossberg’s sister, Tatiana, has spoken publicly about her devastating terminal cancer diagnosis, some of his past detractors are offering apologies.

A source tells Page Six that Jack — the TikTok influencer and congressional hopeful son of Caroline Kennedy and Edwin Schlossberg — faced Internet trolls earlier this year when he suddenly shaved his head, with online commenters chalking it up as a stunt for attention.

“He wrestled with telling social media why he shaved his head — because he was so castigated for it,” says a pal. “Some of the haters were using it to say ‘Look. Look. He is crazy.’ Despite all that, he refused to exactly say why he did it. It wasn’t his news to share. It was his sister’s.”

But Jack, who’s known for his sometimes zany social media posts, shaved

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