No. Nothing rock star-ish about going on stage and playing other players stuff every night imo. Once he contributes to GNR in terms of a record I will reconsider my stance.
I'd love to see you go on stage and do what he does and try and stay grounded..
But anyways.. I don't think he is "acting" like a rock star... thats kind of a blind statement. That's like saying Axl, Slash, Duff, Izzy and Steven were "acting" like rock stars before they made it big and were playing cover songs in bars.. that was just them and how they acted.. and they were doing a lot worse shit then DJ ever did.. so why is DJ any different? I don't think he is pretending to be some huge rock & roll star to impress anybody, I think he's just being himself.
I know a lot of people that get drunk and do stupid shit... and they're not trying to be rock stars..