"The way they handled the situation, saying they were going for lunch and then going to Blackburn, was shocking," Bruce told BBC Radio Humberside.
"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."