I did the same thing to someone in 5U. He went from S to S-. Guess how kind he responded to me after I beat him. 
Free Step Dodge
KING JAIMY
xDevious
Lmao, it's kinda fun to be the one to de-rank someone.. XD Well, I guess it was about the same response I got; "u suck, noob" *kicked* XD
KasumiLover
Savage
ChaolanLegacy
There are worse things than that,like starting off the day in ranked with you being at the risk of getting demoted in your first match.