It gets chucked over here too. Mostly it's when he has finished and is full or when he doesn't like something. It's how I figured out he doesn't like tomato, and a few other things. Lol
He thinks it's funny some days and laughs while he's doing it. I scream on the inside those days.

Good luck. I'm not any help cause DS1 wasn't into the food throwing deal. He used to just gobble it all up. I'm hoping it passes soon though.

xox