WARNING! OLD FART ALERT! You HAVE to know this was coming . . . .
I'm sorry, I don't find this in any way entertaining or informative.
Sanctioned autocross? Sure, go for it.
Idiots in an unmonitored parking lot, with curbs and trees, and NOT A SAFETY VEHICLE IN SIGHT, no helmets? Incredibly stupid. You'd be surprised how out-of-control such seemingly innocuous activity can turn out really, really badly.
Seriously, go to a track day, go to an autocross, participate in a monitored, sanctioned event.
If I am missing something or misinterpreting this, apologies, but if this is really someone just playing around in a remote parking lot, incredibly irresponsible.
If this is really what it appears to be, I don't care how much experience the driver has, there was no "winner".
Let the flame war begin.