I would always time my dinner for 5:00 PM, when Tucker came on. When he was fired, I stopped watching Fox News and now watch Newsmax or MSNBC.
It is often quite pronounced.
I got that same feeling the first time I watched O'Reilly on some talk show or whatever it was. I just took a dislike to him. Couldn't explain it.
I also got the same negative feeling about Bill Cosby. I loved hime when I grew up and listened to his records. But in the times I saw him on television, something hit me very negatively. Could never put my finger on it. But when I heard many years later that he was accused of drugging females to have sex with him, it didn't even make me bat an eyelash. I don't know if it is true or false, but my gut tells me he could do that.
As for O'Reilly, when I saw his infamous "F*** it! We'll do it live!" video, I realized I had hit the nail on the head with my gut impression.