When I spared I followed these rules.

Thou shall not complain, to one's friends, or to one's opponents.
Thou shall not spar anyone below 3-1
Thou shall not compare their skill to anyone else's.
Thou shall not respond to rage comments
Thou shall not draw attention to one's self.
Thou shall not join spar guilds if invited.
Thou shall not change slots after every loss.
Thou shall not make excuses.
Thou shall always keep a cool head.