How to show nodes where the user is (not) in the reference field with Views? I have a content type with a multiple-values user entity reference field. 

I need a view that shows (as two pages or within one view) (a) all the nodes where the user IS referenced and (b) all the nodes where the user is NOT referenced.

There is a relationship to the user reference field and a contextual filter (uid of the logged in user). This "positive" works and shows the nodes where the logged in user is referenced

But the view where the user is not referenced does not work. Is there a way to "negate" the contextual filter (uid of the logged in user)?

I have tried it in one view with an exposed filter (current user), but I could not solve the problem of having multiple user references. I tried the VIEWS distinct feature and the views_distinct modules.
You can use exactly the same you did for positive reference but with a single exception. You will see a checkbox contextual field setting names "Exclude". You can check that and the views will exclude the records which have not referenced.