Bikers not welcome at car exhibition on L'Ormarins

I wanted to take clients into L'Ormarins farm in Drakenstein the other day, but since we were on bikes, we were not allowed onto the premises or even park our bikes by the gate and walk to the car exhibition! What does Johan Rupert have against bikes on the premises? Is he afraid his horses will be scattered?
Can somebody close to Johan please ask him about this discrimination? At least let us park by the gate and allow us to walk to the exhibits. ???