I think people are going a bit OTT about Dack's lifestyle. Let's assume he plasters it all over the internet when he's out, as many people do these days.
I follow him on Instagram and when he first signed, he did seem to be out a lot, but then it was massively reined in until the end of the season (discounting the night out the team had post Charlton away).
He might well be out more than I give him credit for, admittedly, but if he is, I'm not sure people would have any proof of this unless they see it with their own eyes.....