Tarek El Moussa flipped out…literally. According to #ShuterScoop, HGTV executives called an emergency internal meeting this week after The Flip Off star was charged with a battery citation following a violent incident at a Las Vegas casino. “He knocked the guy out cold in public,” a network executive reportedly told the site. “This isn’t Bravo — HGTV is supposed to be calm and clean,” they added, referencing Bravo stars’ violent brawls at times. The fight happened in early June 5 inside the Palazzo at The Venetian. Witnesses report the father...