On 10 August 2018, McInnes's Twitter account, as well as the account for the Proud Boys, was permanently suspended by Twitter due to their rules against violent extremist groups. The suspension was ahead of the first anniversary of the Unite the Right rally in Charlottesville, Virginia, and the small Unite the Right 2 Washington protest in August 2018 in which the Proud Boys participated.
On 12 October 2018, McInnes participated in a reenactment of the 1960 assassination of socialist politician Inejiro Asanuma by Otoya Yamaguchi at the Metropolitan Republican Club. After the event, a contingent of Proud Boys were caught on tape beating a protester outside the venue, after members of Antifa threw a plastic bottle at them.
On 21 November 2018, shortly after news broke that the FBI had reportedly classified the Proud Boys as an extremist group with ties to white nationalists, McInnes said that his lawyers had advised him that quitting might help the nine members being prosecuted for the incidents in October and he said "this is 100% a legal gesture, and it is 100% about alleviating sentencing", and said it was a "'stepping down gesture', in quotation marks". Two weeks later the Special Agent in Charge of the FBI's Oregon office said that it had not been their intent to label the entire group as "extremist", only to characterize the possible threat from certain members of the group that way.
On 3 December 2018, Conservative Review Television (CRTV), on which McInnes had hosted the Get Off My Lawn program, merged with BlazeTV, the television arm of Glenn Beck's TheBlaze, to become Blaze Media. McInnes was expected to host his program for the new company, whose co-president called McInnes "a comedian and provocateur, one of the many varied voices and viewpoints on Blaze Media platforms." Less than a week later, on 8 December, it was announced that McInnes was no longer associated with Blaze Media, with no details given as to why.
In reaction to the Proud Boys-instigated fight in October 2018, residents of the suburban Westchester community of Larchmont, where McInnes lives, began a "Hate Has No Home Here" campaign, which involved displaying that slogan on lawn signs around the community. One resident said "We stand together as a community, and violence and hate are not tolerated here." Several days after the signs began appearing, McInnes' wife sent emails to their neighbours saying that the media had misrepresented McInnes.
Although McInnes cut ties with the Proud Boys publicly in November 2018, stepping down as chairman, in February 2019 he filed suit against the Southern Poverty Law Center over their designation of the Proud Boys as a "general hate" group. The defamation suit was filed in federal court in Alabama. In the papers filed, McInnes claimed that the hate group designation is false and motivated by fund-raising concerns, and that his career has been damaged by it. He claimed that SPLC contributed to his or the Proud Boys' being "deplatformed" by Twitter, PayPal, Mailchimp, and iTunes.
Although McInnes was not a defendant in the August 2019 trial of members of the Proud Boys for their part in the violence that occurred after a meeting of the Metropolitan Republican Club in October 2018, prosecutors repeatedly invoked his name, his words and his views in their questioning of the defendants, after testimony by the defendants and other Proud Boys opened the door to that line of questioning. During closing arguments, a prosecutor said that "Gavin McInnes is not a harmless satirist. He is a hatemonger," while the defense said that McInnes was being "demonized."
In November 2018 it was reported on the basis of an internal memo of the Clark County, Washington Sheriff's Office – based on an FBI briefing – that the Bureau classified the Proud Boys "an extremist group with ties to white nationalism". Two weeks later, the Special Agent in Charge of the FBI's Oregon office denied that the FBI had made that designation about the entire group, ascribing it to a misunderstanding on the part of the Sheriff's Office. The SAIC, Renn Cannon, said that their intent was simply to characterize the possible threat from certain members of the group, not to classify the entire group. The Southern Poverty Law Center classifies them as a "general hate group". McInnes has said his group is not a white nationalist group.
McInnes is anti-Islam. He has said that "Muslims are stupid ... the only thing they really respect is violence and being tough." He also has equated Islam with fascism, stating "Nazis are not a thing. Islam is a thing." In April 2018, McInnes labelled a significant section of Muslims as both mentally ill and incestuous, claiming that "Muslims have a problem with inbreeding. They tend to marry their first cousins... and that is a major problem [in the U.S.] because when you have mentally damaged inbreds – which not all Muslims are, but a disproportionate number are – and you have a hate book called the Koran... you end up with a perfect recipe for mass murder."
McInnes has espoused the white genocide conspiracy theory saying that white women having abortions and immigration is "leading to white genocide in the West". In 2018, regarding South African farm attacks and land reform proposals, he said that black South Africans were not "trying to get their land back – they never had that land", instead stating there were "ethnic cleansing" efforts against white South Africans.