I'm so tired of people always asking this. What's wrong with challenging someone to a debate? So what if they already have a winner in mind? Prove them wrong and if proven wrong and they still refuse to admit defeat then just walk away.
The point of debate is to try swaying favor for a side you are in favor of by bringing up legitimate feats and facts regarding whatever side you favor and knowing when to concede if you know you're beat, unless you feel you have sufficient evidence to prove your point. There's no point to a debate if you are defiant to the end on a side you favor, ignore any facts that get brought up and refuse to concede regardless of any evidence brought up that might contradict any facts that get brought up. This will lead people to think you're close-minded or have bias for a particular title/ character and they wouldn't want to bother debating with you.
Comic defenders will use their best showings and the anime/manga defenders will counter it with their low showings. It's a never ending war.
Assuming that anyone who favors a character from one medium/ title for a match favors the whole thing is a rather ignorant claim to make. Only diehards would fall under this mentality.