My approach is that if close people expect some justification, I'll enter the "let's figure this out together" mode. If they're not willing to work with me in this mode, they get a clear signal that I'm not cooperating in any other way. If they complain, I point out they're showing me less respect right now than they'd show a random stranger, and we're supposed to be very close, i.e. care about each other.

I try to be very consistent about it - they really can work out pretty much anything with me in a respectful and rational way, so the above is not a dismissal, it's enforcing communications protocol.