Spam that side taunt.
There is NOTHING more annoying than the English voice of Sonic going "YOU'RE TOO SLOW YOU'RE TOO SLOW YOU'RE TOO SLOW!"
If you're lucky, your opponent will be the kind of guy who takes everything seriously, and will tear up at being insulted. This will blur his vision, giving you the clear (lolpun) advantage.
In the case that you're playing the Japanese version, it's still nice because it looks hella cool anyways.
not put in the strategy forum because this is way too unserious to be put there