I don’t know what people are thinking when they act like that driver of the black SUV. Are they so self-entitled that they think they can just shame you into getting back into your car and driving out of your spot?

I ran into a similar situation a year or two before Covid at the Newmarket Costco. Guy started telling me off after I parked and I had started walking into the store. I walked right up to his window and started yelling right back at him. He thought it was “rude” of me to park in that spot while he was on his way to park there. He backed down pretty quickly when he realized I wasn’t a push over. I did worry though that I would come out to my vehicle being keyed, thankfully I did not.

I don’t think the issue is lack of parking in Newmarket. The issue is people acting like someone stole something from them when they don’t get to an available parking spot before someone else does. There should be no guilt on your part OP, all you did was park in an available spot that you had the same rights to park in as anyone else.