My main always takes a pounding in these kind of threads. I guess if I didn't main Sonic, he'd piss me off too.
(general permission granted for anyone who'd like to sig that)
What everyone else finds annoying about Sonic, we've grown to love. The speed. The "death by 1000 needles" style. The "Come on, step it up!". And yes, the "You're too slow!".
As for me, I loathe Pit. I'll save you the time and call "pot and kettle" on myself, but the side-B, the "nice try", the "You can't defeat me!", just grates on me. He needs a good beating.