Like one of the earlier responders I had to consider whether it was sexism or ageism. I think it was a bit of both. That is to say, I am sure that if my elder daughter (a very attractive lady who looks a lot younger than her age) had been standing alone in the queue, she would definitely NOT have been overlooked! However, if she had been in the queue with her husband tagging along, it would have been her husband who was acknowleged.
So, judging from your responses, it seems I can't patent the Invisibility Cloak as my invention then?
On a more general issue that has come up in the replies concerning the assumption that women can't understand computers or cars...
On one occasion, afore mentioned daughter was thinking of buying her first, second hand, privately advertised car. It was a classic car, a Renault 5 "Enid Blyton Special Edition" of some age. It was being sold by a man on behalf of his elderly father, who had agreed that his eyesight was no longer adequate for driving. He understood that it was my daughter who was interested in the car and was giving her the guff about "hardly a scratch on it", "spent its life in a garage" etc. but was definitely bemused when I disappeared under it and started to poke around then, satisfied with what I had seen asked him to up the bonnet and start the engine so I could hear how it ran. Then I checked for oil leaks, body rust, uneven tyre wear etc., looked at the oil on the dipper and so on. My verdict (after I had reminded her to have a short test drive) was "If she doesn't want it, I'll have it!" It served her well for several years, until she fell for the Government guff about "clean" Diesel.
My Dad used to take his car to a garage run by a guy called Wally. And he was a proper Wally. Dad would pay a small fortune (but a little less than another garage charged) for a service including new spark plugs. I persuaded him to let me check the plugs after one service. Not only were they not new, Wally hadn't even cleaned up and gapped them properly, so I did it. Dad wouldn't let me do anything else. Next time the car went in for a service (with Wally, of course) it had a speck of red paint on each plug and Dad was instructed to ask for the old plugs back after they were "changed". Wally's reaction finally persuaded Dad to take the car elsewhere.
My boss in my old job, a guy about my age, was struggling to use his office PC to draw some complicated graphs. I volunteered. After a lot of frustration he left me to it, saying that if I "messed up his computer" I would be out of a job and went off muttering about women thinking they knew everything. Half an hour later he came back and found me back at my desk. It took him a while to get over the (to him, humiliating) fact that his graphs were all done and his PC still worked. I had done a computer course, he hadn't, and being a man he didn't know what a manual was.