Taylor Swift Tells Fans to Lay Off John Mayer During 'Dear John ...

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Taylor Swiftdid something super interesting during her performance Saturday night in Minneapolis ... she urged fans to lay off one of her exes.

Taylor has one song which is a surprise to her fans each night at her "Eras" concerts, and Saturday's was "Dear John"-- a biting song about ex-flame John Mayer.

Taylor clearly had bad feelings about John when she wrote the tune, but on Saturday her tune changed. She told the crowd, "I'm 33 years old. I don't care about anything that happened to me when I was 19. I'm not putting this album out so you can go on the internet and defend me against someone you think I wrote a song about someone 14 million years ago."

Taylor explained she was re-recording "Speak Now" which includes "Dear John" because she wants to own her own music, but she clearly says she's not interested in trashing him.

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TMZ.com

Side note ... we haven't heard her say anything like that about "All Too Well," the song about ex-bf Jake Gyllenhaal.