Turns out if you need to "teach" Spotify about music you're not into or never want again, there's a way.
- Make a playlist. Call it something like "Unliked Songs" or "Mistakes were made" I won't judge
- In playlist settings, choose "exclude from taste profile"
Also works on mobile.
Source: https://www.threads.net/@ben_woodward/post/C2sYzylBtgn