Gerry
Steady on mate, we've pretty much all said that you should phone first before setting out to check activity and local procedures.
For example, there would be nothing wrong with joining overhead if both jump plane and parachutists were on the ground at the time, only a reckless fool would consider joining overhead if a jump was taking place. Like many things in aviation, it's all about good judgement based on good information.
No one suggested the A/G guy would lie. Merely, that the ultimate responsibility lies with the pilot. (which it does)
To quote your post:
'yes I have dropped close to dickheads flying over the a/f'
Please explain this as it reads like you actively dropped when you knew an aircraft was in the overhead - surely not..?
Kingy