That Vegan Teacher

In March 2021, she made a YouTube video, titled "Are You Racist?", in which she spelled out the word "nigger" and encouraged people to ban cruelty instead of words. Another controversy arose in result of Diekmeyer's comment on a 2021 TikTok video by gaming YouTuber TommyInnit, where he talked about his YouTube Play Button. Using TikTok's stitch function, she responded, "Tommy! The nice vegan girls don't want to see your buttons, but if you want them to play with your buttons, you're going to have to show them your fruits and your vegetables," while taking out a cucumber, pear, and apple. This sexual joke enraged people online, owing to TommyInnit's age, then 16. Later that year, she was IP banned from TikTok for breaching community guidelines, though the exact cause was unknown. Diekmeyer posted a video on her YouTube page, promising to not give up on her platform. She has made more TikTok accounts but ended up with most of them being banned.

Diekmeyer is known for her TikTok and YouTube career of promoting veganism. She went viral on TikTok for a song, "Eating Animals is Wrong, McDonald's", in July 2020. Rachel Kiley of The Daily Dot characterizes some of Diekmeyer's content as racist and homophobic, including repurposing the slogan of "I can't breathe" for a song about the process of killing animals and arguing that coming out as LGBT is a selfish act as opposed to doing so as vegan. Diekmeyer has drawn criticism for comparing the animal agriculture industry to the Holocaust. In September 2020, she was criticized for saying she would no longer sign her organ donor card, not wanting to donate her organs to meat eaters after she dies. In the month, the video received more than 750,000 views on TikTok and over 100,000 on Twitter.

Diekmeyer speaks English and French. A vegan since June 27, 2016, she condemns what she considers to be vegaphobia. Her open letter, "Dog persuaded them to give up meat", censuring cruelty to animals, was published in the Montreal Gazette in 2004. She has married at least two times, first with Dave, with whom she has three children. She married Giorgio on December 4, 2021 following a courtship of nine and a half years.

In 1995 Diekmeyer composed the nationalistic English-French folk song "Imaginez un Pays/Imagine a Country" for performing at the Unity Rally at the Place du Canada. She spoke of her anxiety before her public performance, which she had never done before, and got help from her friends and relatives to write the French lyrics. Cheryl Cornacchia of the Montreal Gazette called her one of "the dozens of do-it-yourself artists making a place for themselves in Montreal". As of 1999, Diekmeyer had written 47 songs, mainly about life and women's empowerment.

Kadie Karen Diekmeyer (born September 24, 1964), popularly known as That Vegan Teacher, is a Canadian animal rights activist, former educator and singer-songwriter mainly known for promoting veganism. Before she started her online career, Diekmeyer was a nurse and later an ESL teacher but eventually left the latter job at the start of the COVID-19 pandemic. Diekmeyer is known for her TikTok and YouTube that promote veganism. Diekmeyer's content has been controversial, for which she has received accusations of racism and homophobia.

Diekmeyer was born on September 24, 1964, in Montreal, and is of German and Swiss descent. Diekmeyer worked as a registered nurse at the Lakeshore General Hospital for 25 years, and attended Concordia University to become an ESL teacher in French Canadian schools for nine years. She worked both jobs before dropping her nursing career to work full time in the school system and eventually leaving her job at the start of the COVID-19 pandemic.