Hello @Zaxvatov, unfortunately I think you can only transfer favourites, not disliked songs :( 

same problem

Music transfer services simply create a list of songs from the playlist you select, and present that list of songs to the new service.

I’m unaware of any streaming service and/or music transfer service that creates a list of excluded tracks and integrates them into a corresponding list of excluded tracks with the new service.

However, if you have previously established a list of excluded tracks/artists with deezer and import playlists from another service, that exclusion list will still be honored.

Regardless of your chosen service, you will need to set up exclusions on it at some point.

I dealt with this problem for almost a month and found out that the problem is on the side of Spotify.

These idiots didn't come up with anything better than storing a list of blocked songs locally on the device. As a result, after I reinstalled spotify on android, all my library of blocked songs was safely lost.
To say that I was dissatisfied is to say nothing.

Therefore, unfortunately, it will not work to transfer the blocked tracks to Deezer. Thank God that at least Deezer keeps this list on servers...

Than all streaming services are fools, since the list of blocked tracks has no less value (for the algorithm of recommendation) than the list of favorite tracks.

yes it seems the problem is in spotify, i tried reinstalling spotify premium gratis and it solved.

Does the premium version of spotify overcome this limitation?

I was trying to transfer music at the time when my spotify premium had already expired.
But after discovering the bug, I contacted Spotify support and raised this issue too. They said that yes, with premium, my entire library of locked tracks should be restored. But when I restored the premium, no miracle happened. Then I started to deal with Spotify support, and finally found out that the database of blocked tracks is stored locally for some damn reason. By then, I had already deleted the Spotify for Android several times.

But the story in question was in June. It's been almost six months. Maybe Spotify realized he was wrong. :)