Well I wouldn't be angry by that scenario. It would be annoying... much in the same way it's annoying that I've lost 2 games in a row, but as opposed to crying foul, you just say "well done those two teams for beating me"... much like here, you say well done those teams for scuppering my plans.
It's a game... games are played to gain advantages over opponents. It's not breaking any rules... I mean, it's not as if anyone is hacking your account and releasing all your players or anything! He was notified of your bid, he told other clubs you were bidding... he's well within his rights to do that, as he obtained that information through a perfectly legitimate channel.
Also, similar shit happens all the time in the real world (club A bids for club B's player, club B then tell clubs C, D and E that club A has put in a bid)... so we should be grateful that our pittyful, often unrealistic management sim is gaining some sort of realistic trait. The fact that people should be expected to sit by whilst the clubs around them get stronger and not be allowed to say anything is ridiculous in my humble opinion.