Is this collusion?

[Mano]

This happened a while ago and it really bugged me at the time, so I thought I would post it here:

Later stages of a Party NL single table sit n' go, four of us left, big stack is UTG and folds. I am the short stack on the button with KQo and go all in hoping to pick up the blinds. SB is taking a long time thinking and the BB types in something like "I'm folding, so call if you can". SB calls with A3o, hits an ace on the flop and I am out. I am furious and tell the big blind that stating his intentions is cheating, and he claims it is perfectly acceptable "like folding out of turn in a live game" [img]/images/graemlins/mad.gif[/img] . I IM the floor, and they say they will look into it (I doubt they did a thing). Am I right to be upset?? All opinions welcome.