A mother in the UK was arrested in front of her children and locked up for seven hours after referring to a transgender woman as a man online, the Daily Mail reported.
Three officers detained Kate Scottow at her home before quizzing her at a police station about an argument with an activist on Twitter over so-called "deadnaming".
The 38-year-old, from Hitchin, Hertfordshire, had her photograph, DNA and fingerprints taken and remains under investigation.
More than two months after her arrest on December 1, she has had neither her mobile phone or laptop returned, which she says is hampering her studies for a Masters in forensic psychology.
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Writing on online forum Mumsnet, Scottow - who has also been served with a court order that bans her from referring to her accuser as a man - claimed: "I was arrested in my home by three officers, with my autistic ten-year-old daughter and breastfed 20-month-old son present. I was then detained for seven hours in a cell with no sanitary products (which I said I needed) before being interviewed then later released under investigation ... I was arrested for harassment and malicious communications because I called someone out and misgendered them on Twitter."
Confirming the arrest, Hertfordshire Police said: "We take all reports of malicious communication seriously."
The case is the latest where police have been accused of being heavy-handed in dealing with people who go online to debate gender issues.
Sitcom writer Graham Linehan was given a verbal harassment warning by West Yorkshire Police after transgender activist Stephanie Hayden reported him for referring to her by her previous names and pronouns on Twitter. It was complaints by Hayden that led both to the arrest of, and injunction against, Scottow.
High Court papers obtained by The Mail on Sunday detail how Mrs Scottow is accused of a "campaign of targeted harassment" against Miss Hayden, allegedly motivated by her "status as a transgender woman".
The papers claim that, as a "toxic" debate raged online over plans to allow people to "self-ID" as another gender, Scottow tweeted "defamatory" messages about Hayden. She is also alleged to have used accounts in two names to "harass, defame, and publish derogatory and defamatory tweets" about Hayden, including referring to her as male, stating she was "racist, xenophobic and a crook" and mocking her as a "fake lawyer".
Scottow denied harassing or defaming Hayden and said she holds a "genuine and reasonable belief" that a human "cannot practically speaking change sex", but Deputy Judge Jason Coppel QC issued an interim injunction that bans her from posting any personal information about Hayden on social media, "referencing her as a man" or linking her to her "former male identity". Scottow last night declined to comment.