I don't think Lemon's ouster had anything to do with Tucker. Don Lemon really screwed up a lot lately. He is a first-class misogynist with his female co-workers, but he also insulted Nikki Haley by saying she was "past her prime" after she announced she was running for president.

Then he insulted Vivek Ramaswamy, who is running for president. That was the last straw.

https://nypost.com/2023/04/24/don-lemons-fiery-exchange-with-gop-candidate-left-cnn-leaders-exasperated/