LGBT community members have been trending #ProudBoys on social media by posting pictures of gay pride and photos of themselves with loved ones.
The trend is part of efforts to stifle posts and content related to a far-right anti-immigrant group of the same name.
Actors, artists and the Canadian military are among those who have shared supportive images.
The Proud Boys group denied being a homophobic organization.
Since the beginning of last week, the term #ProudBoys has been tweeted more than 88,000 times.
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Most of them have been published since October 1st. On that day, former Star Trek actor and LGBT rights activist George Takei suggested on Twitter that "gay guys" should use the hashtag to share pictures of themselves "kissing or doing very gay things" .
His tweet also referred to a similar campaign by Korean pop music (K-pop) fans launched earlier this year. In support of the Black Lives Matter movement, Twitter users flooded social media with images of Korean musicians with the hashtags #WhiteLivesMatter and #AllLivesMatter - tags that were used online by people critical of the Black Lives Matter movement.
Other attendees in the latest #ProudBoys trend have included Bobby Berk, a host of the Netflix show Queer Eye.
The Canadian military also shared a photo of two men kissing, which has been shared over 27,000 times.
Enrique Tarrio, president of the Proud Boys group, told US broadcaster CNN that he is unsure of what social media users are trying to achieve.
"I think he's hysterical," said Mr. Tarrio. "This is not something that offends us. It is not an insult. We are not homophobic. We do not care who people sleep with.
"One of the messages they want to send with this is that they are trying to stifle our supporters, they are trying to silence us," he added. "When you try to stifle the thoughts of others, I don't think there's anything progressive about it."
Founded in 2016 by Canadian-British right-wing activist Gavin McInnes, the Proud Boys are a far-right, anti-immigrant, all-male group.
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While not exclusively white, they have become notorious for their violent clashes with rival left-wing groups. Facebook, Instagram, Twitter and YouTube have all banned the Proud Boys from their platforms.
US President Donald Trump drew criticism last week after comments on the group during a presidential debate with Joe Biden. When asked to condemn white supremacy and militia groups, Trump instead called on the Proud Boys to "stand back and watch."
Many members of the group, including Mr. Tarrio, took his words as support. But the president has since said he condemns the Proud Boys and all white supremacists.
