If I politely say "Excuse me, I'm not sure if you realise but you've parked in a P&C space" and someone replied "My teenage son has autism and ADHD and I need to use the space" I'd say "crack on". I think most people would
If the BB spaces are full, then the next option is P+C in order for my disabled young adult relative to get in and out of the car easily.
Do you check to see if there is a BB on the dashboard before you start noseying into peoples' "rights" to park in a P+C space?
You'd have been told that because it's none of your business, I'll disclose my young relative's confidential medical diagnoses to you when you provide me with yours. You'd also have had their Blue Badge waved at you in a non-menacing fashion.
By all means go and ask store security to intervene, they would only tell you how out of order you are being with your self-appointed parking police stance.
And of far more concern to me, who only knows what sort of a state that would have caused my relative to be in, terrified probably and not understanding why someone was verbally attacking me. It could take hours for them to recover.
Can you explain why we should have to put up with that level of intrusion and harassment from people like you just to go supermarket or retail park shopping?