You almost collided with him on the exit, and he may have thought you we letting him change lane. What he did after however was just unhelpful, and dangerous.
There is absolutely no need to park on a pavement, preventing pedestrian access anywhere, but to do it at a primary school is the most dangerous and stupid place of them all...
Looks like your typical fat muppet that thinks rules dont apply to him!
Or on reflection he probably can not read bless his illiterate socks! (if he knows how to put them on that said! ......lol
You almost collided with him on the exit, and he may have thought you we letting him change lane. What he did after however was just unhelpful, and dangerous.