Well I looked in the club rules they gave me where I'm getting instruction and will most likely join that club soon and this is all I could find...

"Every member in good standing is responsible and has equal power to enforce the Safety and Flying Field Regulations".

So I'm guessing if more than 1 guy said to someone "new" that your plane isn't safe to fly - you either would have to get ugly and demand to fly - or you would go home and fix it and come back.