i don't really have one
the phrase a brain-dead person uses to sound smart, but it’s just a way to avoid making a decision when asked what they like best about something they didn’t even bother to care about
'I don't really have one', after being asked what they like about the new song they didn’t even hear
'I don't really have one', when asked what they like about the concert they didn’t even go to
'I don't really have one', when asked what they like about the snack they didn’t even eat