Jarhead, take a look at FAA Advisory Circular 61-98A. That is the gospel from the FAA on how BFR's are to be done. There is a wide leeway for approval or rejection of a BFR signoff and selection of instruction material. Many of the lower quality pilots will get multiple BFRs looking for an easy instructor. Take it as a challenge by this guy to read up on W&B and go back and impress him. Should he have continued you for not knowing it? I can see the argument for either side. Bear in mind if a CFI signs someone off and then they go have an incident or accident, does not matter what the cause was, they are on the line and it's not worth it to be sloppy giving signoffs.