This nasty impatient driver thinks its ok to sound the horn at a student driver who only stalled once and before the engine automatically restarted sounded the horn, it was only a few seconds and didn't deserve a horn blast. To add insult there was a traffic queue 50 meters ahead which made this Porsche driver need to stop again anyway.
In the first clip I think the dashcammer is also a danger. They shouldn't be tail-gating and acting aggressively - they made the situation worse.