Its irresponsible of a experienced flying instructor not to give sound advice to inexperienced or experienced pilots.
Within a flying club the CFI as ultimate say as to wether someone goes flying or not, if only to protect the clubs investment in aircraft.
Remember when they sign up memebership, its to abide by the club rules as per flying order book.
The biggest dilema is when you see a Private owner venture off on a suicide mission, with total disregard, as i have recently experienced.