Many people are calling out `Harry Potter` author J.K. Rowling for a series of anti-trans tweets on Saturday afternoon.

Rowling's latest controversy began when she commented on an article from Devex, a media platform for the global development community, titled `Opinion: Creating a more equal post-COVID-19 world for people who menstruate.`

`'People who menstruate.' I'm sure there used to be a word for those people. Someone help me out. Wumben? Wimpund? Woomud?` Rowling tweeted.

People on Twitter immediately called Rowling's comments `anti-trans` and `transphobic` as transgender people, non-binary people and gender-nonconforming people can also menstruate. Rowling followed that tweet up by criticizing the idea that someone's biological sense isn't real.

`If sex isn't real, there's no same-sex attraction. If sex isn't real, the lived reality of women globally is erased. I know and love trans people, but erasing the concept of sex removes the ability of many to meaningfully discuss their lives. It isn't hate to speak the truth,` she wrote. `The idea that women like me, who've been empathetic to trans people for decades, feeling kinship because they're vulnerable in the same way as women - ie, to male violence - 'hate' trans people because they think sex is real and has lived consequences - is a nonsense.`

People on Twitter immediately called Rowling's comments `anti-trans` and `transphobic` as transgender people, non-binary people and gender-nonconforming people can also menstruate. Rowling followed that tweet up by criticizing the idea that someone's biological sense isn't real.

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Author J.K. Rowling received backlash on Saturday for posting a series of tweets many called `transphobic,` prompting a response from GLAAD who stated `In 2020, there is no excuse for targeting trans people.` What went down, at the link in bio. 📸: @gettyentertainment

A post shared by Hollywood Reporter (@hollywoodreporter) on Jun 6, 2020 at 11:00pm PDT

`If sex isn't real, there's no same-sex attraction. If sex isn't real, the lived reality of women globally is erased. I know and love trans people, but erasing the concept of sex removes the ability of many to meaningfully discuss their lives. It isn't hate to speak the truth,` she wrote.