Pedro Pascal blasted “heinous loser” J.K. Rowling’s anti-trans views before co-signing a “Harry Potter” boycott.

The “Last of Us” star took to social media after the author celebrated the Supreme Court of the United Kingdom declaring that transgender women aren’t legally considered women, to express his very honest opinion of her.

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“Awful disgusting S–T is exactly right. Heinous LOSER behavior,” he commented under an Instagram video of a creator who dubbed Rowling’s reaction a “serious Voldemort villain s–t.”

Social media activist Tariq Ra’ouf called Rowling out for “reveling in the fact that she helped the UK Supreme Court define that transgender women are not women legally.”

“She’s just so proud of the work that she’s been doing for the last couple of years to stoke hatred and fear into the general public about a very small minority population that’s already some of the most misunderstood people on the Earth.”

He went on to call her “so happy” and “cocky” before urging his followers to boycott anything “Harry Potter” related going forward.

“Trans rights are human rights. Transwomen are women,” he called out before asking his fans to “make sure Harry Potter is not profitable for anyone who dares to make business with J.K. Rowling.”

“That awful disgusting s–t has consequences,” Ra’ouf concluded in his video, which has garnered more than 33,000 likes and thousands of comments in support.

Pedro, 50, has been a vocal supporter of the LGBTQIA+ community, especially after his sister Lux Pascal came out as a trans woman in 2021.

Most recently, the “Mandalorian” star stood by his sister and voiced his disapproval of the UK’s ruling by wearing a “Protect the Dolls” T-shirt to the London premiere of “Thunderbolts.”

The T-shirt was designed by Conner Ives to call attention to the global anti-transgender sentiment that trans women are experiencing in several countries.

“Dolls” is an affectionate term coined by the LGBTQIA+ community to refer to transgender women.

Last week, the five judges of the UK Supreme Court agreed in the landmark ruling that “the terms ‘woman’ and ‘sex’” under the country’s 2010 Equality Act “refer to a biological woman and biological sex,” Justice Patrick Hodge said.

The ruling “does not remove protection from trans people,” who are “protected from discrimination on the ground of gender reassignment,” the court confirmed — but a transgender person with documentation recognizing them as female should not be considered a woman for equality purposes.

Shortly after, Rowling took to social media to celebrate the ruling by writing, “Think I might be having a cigar later.”

“The Supreme Court upheld the rights of women and gay people today,” the 59-year-old said in another statement.

Rowling has a long history of anti-trans views. She even once proclaimed that she would “happily” go to prison for her beliefs.