Matthew Hawn, who had been a tenured teacher at the Sullivan County School District since 2008 and baseball coach at Central High School, was dismissed by the local board of education on June 8 in a 6-1 vote for two separate incidents where he taught about race, reported WJHL.com, a news outlet based in Johnson City,Tenn.
At issue was Hawn assigning the essay “The First White President” by Ta-Nehisi Coates to students in his Contemporary Issues class in February, and later in March, playing a video of “White Privilege,” a spoken word poem by Kyla Jenée Lacey to the same students.
“[Donald Trump’s] political career began in advocacy of birtherism, that modern recasting of the old American precept that Black people are not fit to be citizens of the country they built,” Coates writes of the former president. “It is often said that Trump has no real ideology, which is not true — his ideology is white supremacy, in all its truculent and sanctimonious power.”
First you need to understand what "tenure" (which is properly called "career status") in K-12 education means in most states in the South. "Tenure" simply means that you are not on a year-to-year contract (typically one year) and that an administrative board must meet in order to terminate you. Nothing more than that. This is not the "tenure" which college professors have at a university.
Second - K-12 teachers in North Carolina and Tennessee must follow the state curriculum when teaching a subject. If they stay within the state curriculum then they are safe otherwise they are likely to be terminated. I have a family member who teaches middle school social studies where one of the instructional years covers international history. It includes a unit on comparative religion. Every year they have parents complain that she is teaching about Muslims --- but she strictly sticks within the state curriculum on the subject. Therefore she is safe, if she stepped outside the state/local approved material she would be terminated.
This teacher in Tennessee clearly stepped well outside the the bounds of state-approved curriculum and was quite properly terminated with cause. This is not an example of "Cancel Culture". You really should get a better understanding of what is "Cancel Culture" and what is not.