Let's look at what's actually been said.
- Akinfenwa has not called anybody racist
- He has not considered it to be meant as a racial slur
- He has taken offence at being compared to a fat Water Buffalo (the connotations of savage, stupid, slow on the uptake and also of speed,, but strong, among many, are obvious), and considered that a racial slur he would rather not have directed at him again.
Nobody is condemning the person who said it, nobody is casting any aspersions on their character, nobody is suggesting there are any hard feelings afterwards. What is being suggested is, please take my feelings on board next time and, if possible, adapt your behaviour accordingly.
What, actually, is wrong with that? The only people who are questioning somebody's character are those questioning Akinfenwa.