I fail to catch your logic to be honest. I found Juve of the late 90's very flashy and played some attractive football, maybe others don't, that's why they chose not to support Juve.
I'm not from Turin nor Italy, I just liked a football team as a kid and stuck with it all these years. Love grows, bro.
When those new Barca fans actually stop supporting Barca if they go through a difficult moment, then YES, they're probably a bunch of idiots.