Hey @Alabamax, thanks for reaching out to the Community!
The Dislike/Hide song option on Desktop is only available on the Discover Weekly and the Release Radar playlists. If you don't see the option in those two on your desktop app, try running a clean reinstallation, following the exact steps from this Spotify Answer.
Let me know if you need help with anything else!
Hey there you, Yeah, you! 😁 Welcome - we're glad you joined the Spotify Community! While you here, let's have a fun game…