The bar is more like "Coke can sue you for wearing a red shirt." That doesn't mean they'll win, but they _can_ sue you.
https://issuu.com/bidc-blog/docs/0717-018_bidc_blog_-_tradem...
Do you not understand how the legal system works?
I couldn't prove tortuous malignment. You haven't accused me of committing a crime or something. I haven't lost income as a result of it. So I wouldn't win, but I could sue.