An issue on which you are either for or against, love or hate, but not anywhere in between. Opposite is an analogue issue where degrees of support are possible. Really should be binary issue from the analogy with 1/0, but that's very 20th Century, while digital/analogue is more contemporary. Example: Don't you think whether you like Philip Glass is a digital issue? I mean, you either love his music or it drives you mad.
DIGITAL ISSUE
Meaning of DIGITAL ISSUE in English
Slang English vocab. Английский сленговый словарь. 2012