ashleynatlanta,
As they say, "don't hate the game; hate the player!".
They are plenty of Harley guys out there who ride like douchebags too (i.e. blasting their exhaust in 1st gear at 2am, or turning the kill switch off to cause a loud backfire, etc.)
It is unfair to stereotype all sportbike riders like that.
I, for one, ride one and do not always ride like that. There are times to ride crazy and times not too. Most of time when I ride like that it is at night, on an open highway.
Let me explain, if I can, the lane splitting thing though. Because there have been plenty of times when I do it. The reason that I lane-split to the front of the lights is because, even though my bike is oil-cooled it still overheats. Sitting in traffic does not help in this matter.
Another reason for lane-splitting to the front is to avoid being part of a Buick sandwich...if you know what I mean. I would rather be at the front lights and piss a few people off, than be between two cars and have someone behind me not pay attention to the red light and use me as a hood ornament.

I have seen it happen.
Not all sportbike riders are squids.
Stone