The Tigers defender was red carded after the full-time whistle for a shove on Alan Lee, who was accused of making a meal of the situation by the Hull boss.
"We are appealing his red, you can understand why," Bruce said. "I knew there must have been something in it for him to react like that.
"I thought it was cowardly by Alan Lee, I thought more of him, I have had a pint of Guinness with him, I have played his guitar and I thought more of him.
"Cheat is the right word for him, I don't use that lightly but that's the right word for him. He's 15-and-a-half stone and he went down like that.
"That has ruined the afternoon, we had the best referee in the country in Howard Webb and I have spoken to him. He will report it and hopefully there is some justice.
"Alex is wrong with his retaliation, but he only pushes him in the chest. He's my son but he takes after his mother."
Alex Bruce later tweeted: "I apologise to everyone connected with the club. I let everyone down reacting to being elbowed off the ball."
Before the ugly scenes at the end, Hull recorded their third straight victory thanks to Robert Koren's eighth-minute strike and a second in added time from David Meyler, although Bruce believes the scoreline flattered the Terriers.
"It was an excellent performance and we were the better team by a million miles," he added. "Our only Achilles heel is our conversion of chances that we create."