In the desktop app you should be able to select the song and press the delete key on your keyboard. In the Android app there is an option in the menu to delete the song. In the iOS app you have to scroll to the top of the playlist and press the "..." button. Then tap on edit and scroll to find the song and press on the red minus symbol to remove from the playlist.
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It's so disappointing and frustrating that one can't remove a signle track from a playlist from the context menu or 3D touch menu.
There is even an option to remove it from the library but not the playlist - it's absurd!!!
Apple Music - they listened to user votes and the feature is there.
It's extremely user unfriendly from spotify to force a user to switch into the edit mode.
There are 5 FIVE!!! crazy unnecessary button clicks and swipes to remove a signle song. I'm testing the iPhone version 1 day and already found bugs which make the experience worse. False high hopes. Sad.
Does anybody know any developer channels / user feature votes for spotify?