This can be partly due to a misplaced form of politeness; (i.e. not wishing to poke their noses in where it may not be wanted), but is more usually just plain unconcern.
Stange people standing around looking lost are often someone else's passengers, the someone else being in the loo / doing the paperwork / getting the aircraft refuelled / whatever.
A few weeks later I went to their summer barbeque. I was a little late arriving and the barbeque was already in progress. All the existing members, (none of whom I knew,) were standing around in groups talking. I sat down and waited for someone at least to ask who I was and what I was doing there or else for payment of my barbeque entrance money. Not a soul came near. After half an hour I got up and left.
Any chance that the club members there were socially dysfunctional aeroplane geeks who were simply frightened of a real live woman?