Birmingham chairman David Gold has demanded an apology from Aston Villa director general Charles Krulak for his "pig in the mud" attack.
Krulak made his verbal attack on a Villa fan website after Gold had said all clubs should drop ticket prices by 20%.
Krulak had responded by pointing out Villa fans were being charged £55 for the derby at St Andrews in November although, in fact, the correct price is £45.
Gold told the Birmingham Mail: "I was made aware of the quote but didn't really look any deeper into it nor this whole issue until the last couple of days.
"Then it became to clear to me that many objectionable things had and been said and written.
"I received an e-mail from our managing director Karren Brady saying how outrageous it was and I cannot just sit by and not defend myself as I am very aggrieved on a number of counts.
"First, it is clear that this was all kicked off by this general on an internet message board as he had not got his facts right.
"He wrote that it was £55 for the Villa game in November - wrong.
"To then use my name in an analogy about pigs and mud I find distasteful and insulting. Whether it is 'Americanese' or not, he should not have written that kind of thing.
"I supported Doug Ellis during his demise (as Villa chairman) and, aware of the sensitive nature of the rivalry, I feel I have brought a fair and balanced view to matters between the clubs and not positioned myself aggressively.
"Then this man comes along and maligns me, and calls me publicity seeking. Well, what's he doing exactly, writing something like he did and trying to be the fans' friend in this way on the internet?
"I find it bizarre that someone in his position is using such a forum to air his views as it is, let alone the downside it has brought on me.
"I think something should be forthcoming from him, an apology, a retraction, something."