Probably get flamed by all the 'rules is rules' people here but here goes.So me and my mum are in Morrison's underground car park yesterday looking for a parking space.My mum,who has a blue badge, due to the fact she has terminal cancer, is driving.She drives past the disabled parking bay(space for less than a dozen cars) which is full,so stops directly at the end of this bay which happens to be a parent and child bay and says 'I'll stop here'.This bay used to be a disabled bay and has has room for about a dozen cars and has only one car in it-a people carrier with a man in the driving seat and a kid/kids in the back.I tell my mum she can't really as it's for parents with kids now and she's like 'Well I've always parked here' LOL and I'm like 'Well you can't now,but if you want to risk a fine it's up to you'.Anyhoo as we're merrily bickering away-engine not even switched off- yet a woman approaches the car that the bloke and kids are in and shouts at my mum 'It's for people with kids!' then shouts the same again before we've even had the chance to respond.Well excuse me but no-one shouts at my mum like that,so I lost it a bit and a full on argument ensued,where I pointed out to her that there were so many mother and child spaces free(just behind us,in the lane next to the full disabled bay there was another double bay for them with lots of spaces free too),and that my mum was disabled and her parking there wouldn't affect anyone and if she wanted to risk a fine what the hell did it have to do with her! I did call her a couple of names-an interfering cow (which she is)being one of them,and it wasn't my finest moment but I don't understand why she would start shouting at an elderly person in such an aggressive manner for,in my mind,such a trivial thing.AIBU?