You can tell the system the artists and songs you like, but telling the system you don't like artists is much less intuitive. I love Bryce Vine, so I press the like button. I know I don't like Cardi-B (Don't hate on me), so why can't I search her up and "dislike" her? I think this is a necessary feature to implement. You are selling a personalized music experience, and it is very annoying to get songs or artists in my auto-play I could very easily mark as not wanted.
Updated on 2019-01-02
That's a great idea, but something similar has already been suggested.
You can check it out here.
Have a nice day!