I always taught my kids to applaud good play by any team.
If you're going through the BS that is going to the AFL these days, you're doing it to see the best of the best play footy.
If an opposition team or player, does something spectacular, why wouldn't you acknowledge it. I don't mean cheering them on, just acknowledge good play.
Boooing is just plain dumb (unless it's Maynard)
As for those getting stuck into JVR, the kid has just turned 21. Apart from Fritta, it's been an incredibly up and down forward line and delivery is only just getting sorted out, let alone playing with the same blokes up forward week in week out.
Be patient, I reckon he's going to be a Coleman medalist for us once he matures and our forward line and systems doo too.