Hello:
Currently there is not a way to ignore certain songs or artists from a Spotify or user promoted playlist. There are many New Ideas here: https://community.spotify.com/t5/New-Ideas/ct-p/newideas a keyword search should turn up many ideas along this type of wanted feature.
In the meantime, the easiest work around is to just copy and paste the songs from any Spotify or user created playlist into your own created playlist, and then just remove the unwanted songs from your new created playlist.
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