Agreed with the consensus.
Should have a phone call (pet peeve of mine also if there isn't one, particularly as A/C go tech earlier in the day meaning you turn up to find none available, which could have been told to you before you travelled.)
FOB rules is rules so to speak. It can be a bit annoying though, as the original poster said:
The club in question was still conducting training flights on that day
Which does beg the question as to whether schools/clubs have one weather minima for instructors and one for anybody else. Won't knock this, somebody will have a reason for it.
Generally though, decisions made by CFIs etc. are made based on their experience and judgment. If you're at a club where you trust the senior staff, then you have to accept that if they make a decision it's because they feel that anything else would present unacceptable risk. Remember the adage about OLD/BOLD pilots. I guess a lot of accidents would have been prevented if an experienced hand was placed on the shoulder of the pilot as he walked out to the aircraft.
Alternatively, if you don't like/trust them, leave - but just beware that if you find somewhere that leaves the decision making to you, not unreasonable for a licence holder to make go/no go decisions, you're far more likely to end up 'up there, wishing you were down here.'