Bruce has accused DJ Campbell and his representatives of showing a 'lack of respect' during transfer talks when the player just disappeared.
Bruce was sure that he had done enough to get the striker to sign for the Tigers from Premiership outfit Queens Park Rangers, but instead the player decided to abandon talks and head for Blackburn Rovers who had shown an interest late on.
Bruce told reporters: "The way they handled the situation, saying they were going for lunch and then going to Blackburn, was shocking.
"I've never felt so disappointed."
He added: "We were left trying to find out where they were for the best part of two hours.
"I've got absolutely no problem with him going to Blackburn if they'd just phoned and said 'thanks for your offer but we've had a wonderful offer from Blackburn'.
"The lack of respect by him and his representatives left a bad taste in the mouth."