Gavin McInnes, founder and former head of the white nationalist group Proud Boys, filed a federal lawsuit against the Alabama-based Southern Poverty Law Center on Monday after the group branded his work hate speech and he lost most of his social media access.

McInnes, a Canadian immigrant who now lives in Westchester, claimed in the suit that he was an “avowed and vocal opponent of discrimination based on race, religion or sexual preference, and of ideologies and movements espousing extremism, nationalism and white supremacy.”

McInnes said the SPLC was “defaming him by use of the SPLC Hate Designations, and publishing other false, damaging and defamatory statements about him” in the suit, filed in Alabama Middle District Court.

McInness, 48, called himself a “humorist, businessman, political commentator and social critic,” and said he was banished from most social media platforms because of his inflammatory statements.

He said the Proud Boys — whose members have a history of violence and neo-fascist rhetoric — were just a pro-President Trump “men’s club.”

“The SPLC has gone from a noble institution genuinely dedicated to eradicating hate to a hate group in and of itself that pretends this country is frothing with bigots desperate to foment World War III,” McInnes said in a statement announcing his suit, which was first reported in the far-right Gateway Pundit.

The statement continued: “My family has been attacked and so have my friends. The pro-Trump men’s club I started, the Proud Boys, have been rounded up and arrested facing serious felonies for daring to defend themselves against the radical left. It’s not just my circle of conservative Christians. Seemingly countless business and careers have been ‘destroyed’ by this group,” he said.

The SPLC had taken a darker view of the Proud Boys, arguing that violence was central to the group’s activism.

“Violence is at the core of their ideology and their primary tool for silencing their political foes,” the SPLC said.

Since the SPLC listed the Proud Boys as a hate group, McInnes has been booted from Twitter, Facebook, YouTube and Instagram.

McInness won’t be winning any popularity contests in Larchmont, either, where many neighbors have posted “Hate has no home here” signs, prompting McInness to whine that the messages were a form of aggression against him and his family, the Huffington Post reported last month.

The signs began appearing after nine of his Proud Boys were jailed for attacking protesters in Manhattan in October after a McInnes appearance.

His suit claims he was defamed by the anti-poverty group, and he is seeking unspecified monetary damages.

The center did not immediately respond to a request for comment.