That video made me sick, those guys are scum. I feel like I need to take a shower, just hearing all that makes me feel dirty.
Being a sarcastic asshole like that would get you chat banned in soloQ. Meanwhile these guys are getting paid to publicly belittle someone's accomplishments in a professional match, all because they picked an uncommon champ, and actually did well. The shoutcasters acted the exact same way that one game garen was picked, and even though garen actually did nothing that game, they had no right to publicly humiliate that player and turn him into a laughing stock.
There is no place for that kind of talk in any league game,especially if it wants to be treated as a legitimate sport, and letting the casters get away with that kind of caustic banter only breeds contempt for the league esports community.