They weren't being 100% (or even 10%) sincere in this interview, it's worth noting. Morrison was exploring an ultra masculine ironic hard case persona at the time (as was culture as a whole, this was the nineties). It's no different to Nathan Fielder doing this
Comments
Millar really does seem like such a pathological liar that everything up to and including telling his family he loves them is, in his mind, “a really clever bit”
(Might be me happily chucking Millar onto the fire to preserve my fond memories of Big Dave, tho)