Just saw the video on Instagram. I didn't take it as the batter drawing a line in the sand to show up the umpire. I took it as the batter put his bat head on the ground and flicked it backwards as an "well crap, let's step out and regroup" type of action.
Reminds me of an umpire we ran into in a tournament in Missouri. Umpire would not speak to you about any call. If you asked him about a call, even in the proper manner, he took it as a threat. He even yelled at our 10 year old bat boy in the dugout when he told one of our players that it wasn't a strike that got called on his brother. That set off a bunch of people in the stands and his response was "I am a 5 star rated umpire. I will not be disrespected o this field"...which we all started laughing and still laugh at to this day.