Regarding Jwong, I agree with everything that kainzero and HeavyD have posted.
I don't get the hate either. As a competitive FG player, I respect players like Justin to the fullest. The guy manages to play at a high level in a slew of games and keeps consistent.
Regarding people on this forum that don't regularly post in the FGT whining about Jwong, get over it. Honestly, what did Justin do that isn't new to a tournament setting? Players get hype, players get excited, winning is one thing, but winning in full view of a crowd or a good match brings out excitement. Anyone who has played in a competitive tournament setting with or without your crew around you, knows how hype things can get. Expectations from close friends during your round up, haters shouting things at you, your own high expectations, emotions run high and I wouldn't have it any other way.
When I met my normal group of FG friends/crew, I had entered a tournament they put together at a local arcade. Brought a couple guys from my then (old) crew and there was a lot of hype because we had people in their existing crew wondering who these kids were from a different county taking out all their players. Especially from a county that no one realized had any competitive FG players. I took 3rd in CVS2 that night and as I won my matches (from winners and losers bracket), I was quiet and was able to keep my emotions down as the crowd around us was getting crazy.
Flash to years later when playing a friend of mine at a tourney, big turnout. It was a close match in CVS2 and I scrapped out a win. Not thinking, I climbed up on the CVS2 machine in excitement. Those who knew me laughed and knew it was all in good fun and I had just squeaked out a win. My friend I played against knew I was just letting my emotions out as the match was tense (he was familiar with most of my A-Groove setups) and we shook hands and laughed accordingly.
Emotions run high in ANY tournament setting. I don't fault anyone for letting their emotions get to them as long as it strays away from any (really) personal attacks.
Honestly, I feel the hate comes to Justin because of how good he is and how much of in the spotlight he is. Most randoms on SRK or kids who just randomly play Scrub-level FG know about Wong, about Choi, about Daigo. How many times have random kids who don't really play FG but play games in general talked about the Daigo parry video. These guys are celebrities and are amazing at what they do, so naturally people want to hate (as Markman mentioned).
I've met and seen players do FAR worse in a tournament setting and not get all the hate that many of the "bigger" players get. It's sort of silly.
Anyone from NorCal knows about our very own Cableguy. I've seen this guy at tournaments put his foot in his mouth. His skills are definitely there and he's great at Marvel, but if you think what Jwong did or didn't do at EVO is bad, start going to your local tournies and see what else you hear.
http://www.youtube.com/watch?v=7tbOrgnl_P4&feature=related