I used to always hesitate to use that "dislike" button because I was worried that Spotify would not be able to distinguished between "I will always dislike this song" and "I don't want this song in this specific context"
I insta skipped any song that I liked but didn't want in X context, but disliked songs I didn't want, period, I don't know if it was the intended way, but it seemed to work for me