Matt Calkins refused to be muzzled.

The longtime Seattle Times sports columnist detailed his decision to leave the outlet after 11 years, citing a spiked Sophie Cunningham-based column as his final straw.

“After 11 years as a sports columnist at the Seattle Times, I have decided to resign,” he wrote in a post in X. “It was entirely my choice, and it was not an easy one. The impetus was the Times declining to run a column I wrote from the perspective of two female student athletes who were opposed to competing against biological males.”

A representative for the Seattle Times declined comment to The Post.

Calkins, in a Substack post, wrote that he spoke with fans outside of a Seattle Storm game who showed up to support the Fever star — who made headlines when she told ESPN she was against girls competing with biological men in sports — and with one teen in particular who was allegedly cursed out by the team’s owner.

Calkins wrote to the point that “supporting the separation of biological females and males doesn’t automatically make you transphobic.”

A draft of the piece was subjected to a heavy and lengthy review.

“I sent a draft after talking to my editor the morning of Friday, July 31, telling him there was no rush to run it,” Calkins wrote. “He told me later that day that he and others were looking at it, but that it wouldn’t be ready for Sunday’s paper. Monday night, I got an email saying that his boss was hoping to talk to the top two newsroom editors about it on Wednesday. No feedback had been given to me. Thursday afternoon, my editor informed me that it wasn’t going to run because I didn’t tell him I was doing this in advance. I didn’t buy this reasoning. If that were the case, the piece would have been killed on the spot, not passed through the hands of multiple editors over several days.”

Calkin’s response?

“To resign on the spot,” he wrote.

Calkins claims he had several other columns killed during his tenure

“One was a piece questioning whether players for the U.S. Women’s Soccer Team were really the victims of discrimination in their equal-pay lawsuit,” he wrote. “Another was a more general column on cancel culture in sports. The last, written shortly after George Floyd’s death, implored people to listen to state-champion basketball coach Mike Bethea — a black man urging the public not to stereotype cops. The common theme? All of these challenged prevailing newsroom narratives and likely would have triggered the outrage mob.”

Despite facing unexpected challenges following his decision to resign, Calkins seems resolute.

“To be honest, I’m scared s–tless right now,” he wrote. “I have no idea how the next few months or years are going to play out. But that fear beats the indignity of being muzzled.”