Same thing happens to my hubbie. We doTescos together and he then puts the shopping in the car, which is in a disabled bay, while I’m returning Tesco’s scooter and then staggering back out to the car. He hasn’t actually been challenged yet but oh boy if looks could kill! I would have no objection, like you, if he was asked politely why he was using a disabled bay, because actually I’m all for policing these bays, but your ‘old dears’ obviously didn’t want to listen to the explanation. I’m sorry your son had to be on the receiving end of it.
It is hard sometimes. There’s a disabled bay right across road from me so I see it from windows. So often see people park with blue badge and return some time later with heavy bags of shopping. Or one young woman who uses it regularly and then totters off down the road in very high heels.
But I do remind myself that maybe they have a heart problem or a million things like MS that don’t show.
Once again the tabloid press make out that everyone using blue badge is a scammer. All part of an anti-disabled campaign!